The tundra has no large trees because the ground is always frozen. The correct answer is (D).
In the Arctic and on the tops of mountains, where the weather is cold and windy, and there isn't much rain, there are tundra ecosystems without trees. Most of the year, the tundra is covered in snow, but in the summer, wildflowers bloom. Tundra animals and plants.
The past participle of freeze is frozen. 2. adjective. If the ground has frozen, the extremely cold weather has made it extremely hard. The ground was solidly frozen, and it was now bitterly cold.
Safe food can be kept in the freezer at 0 degrees Fahrenheit (-18 degrees Celsius) with proper handling. Although freezing does not kill the majority of bacteria, it does prevent their growth.
Maple bushes Hint: The Tundra has low biodiversity: There are 1,700 plant species, 48 land mammals, and thousands of insects and birds migrate to the marshes annually.
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The survival of organisms can be threatened by... (Lesson Game # 5)
The survival of organisms can be threatened by various factors, including habitat loss, climate change, invasive species, and overexploitation.
Habitat loss occurs when natural environments are destroyed or altered, leading to a decline in suitable living spaces for organisms.
Climate change affects ecosystems by causing shifts in temperature and precipitation patterns, making it difficult for some species to adapt and survive.
Invasive species are non-native organisms that enter an ecosystem and can outcompete native species for resources, causing a decline in their populations.
Overexploitation refers to the excessive use or consumption of a resource, such as hunting or fishing, that can lead to a significant decrease in species populations.
To ensure the survival of organisms, it is crucial to implement conservation efforts, such as habitat restoration, species reintroduction, and sustainable resource management.
These actions help maintain biodiversity and ecological balance, ensuring that organisms have the necessary conditions to thrive and continue their existence in the ecosystem.
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When an intestinal cell has absorbed triglycerides it the froms a _____ to transport those triglycerides to body tissues
Answer:
Chylomicron.
Explanation:
When an intestinal cell has absorbed triglycerides it then forms a chylomicron to transport those tryglycerides to body tissues.
A chylomicron is a droplet of fat present in the blood or lymph after absorption from the small intestine.
shoot elongation in a growing bud is due primarily to ? group of answer choices a) cell division at the shoot apical meristem b) cell elongation directly below the shoot apical meristem c) cell division localized in each internode d) cell elongation localized in each internode e) cell division at the shoot apical meristem and cell elongation directly below the shoot apical meristem
Shoot elongation in a growing bud is due primarily to cell elongation localized in each internode.
D is the correct answer.
Activated shoot elongation is a crucial adaptation phase that can restore contact between leaves and the atmosphere above the water's surface. The rate of photosynthesis is also significantly increased, as is inward diffusion of oxygen.
The plant hormone Auxin promotes cell elongation by making the cell wall more extensible. By causing the wall to loosen, auxin contributes to the control of cell wall characteristics.
Auxins are known to speed up growth in shoots when present in high concentrations. Auxins encourage a plant's shoot to develop asymmetrically in response to sunlight, which enables the shoot to bend towards the sun and assist the plant get more light for photosynthesis.
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Describe in detail (chemical reaction) what is photochemical smog and examples of places that have this type of smog.
Photochemical smog is a type of air pollution that forms when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight. This chemical reaction produces a mixture of harmful air pollutants, including ozone, nitrogen dioxide, and particulate matter.
The chemical reaction that results in photochemical smog is a multi-step process. First, nitrogen oxides (NOx) combine with sunlight to generate nitric oxide (NO) and oxygen atoms (O), which are predominantly emitted by vehicle exhaust and industrial sources.
NO + O --> NO2
The nitric oxide (NO) then interacts with more oxygen atoms (O) to generate nitrogen dioxide (NO2), a reddish-brown gas that contributes to smog's brownish colour.
NO2 + O2 = NO + O2
When exposed to sunlight, nitrogen dioxide (NO2) can react with other pollutants such as volatile organic compounds (VOCs) to produce a variety of secondary pollutants such as ozone (O3), peroxyacyl nitrates (PANs), and aldehydes.
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Question 82
Clostridium botulinum spores are killed in
a. 10 to 15 minutes at 80C
b. 10 to 15 minutes at 80F
c. 1 minute at 250F
d. 10 to 15 minutes at 230F
Clostridium botulinum spores are killed in 10 to 15 minutes at 121°C (250°F). Therefore, the answer is c. 1 minute at 250F.
Clostridium botulinum is a type of bacteria that produces a potent neurotoxin that can cause botulism, a serious and potentially fatal illness. The spores of this bacteria can survive in a dormant state in soil and water for many years and can also contaminate certain types of food, such as canned meats, vegetables, and fish.
To prevent the growth and toxin production of Clostridium botulinum in food, it is important to use proper food processing methods, such as thermal processing. The spores of Clostridium botulinum can be killed by heating the food to a high enough temperature for a sufficient amount of time.
The recommended thermal processing conditions for the destruction of Clostridium botulinum spores vary depending on the type of food and the method of processing. Generally, a temperature of at least 121°C (250°F) for at least 3 minutes is required to kill the spores of Clostridium botulinum.
Therefore, the statement that Clostridium botulinum spores are killed in 1 minute at 250°F is not accurate. A temperature of 250°F is equivalent to 121°C, which is the temperature required for the destruction of Clostridium botulinum spores. However, a minimum processing time of 3 minutes is usually required to ensure complete destruction of the spores.
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before they are cooked or served, raw fruits and vegetables should be thoroughly washed with A. sanitizer. B. natural fruit or vegetable juice. C. potable water. D. non-potable water.
Before cooking or serving, "raw-fruits" and vegetables should be washed with (c) Potable-Water.
The "Potable-Water" is that water that is safe for consumption and free from harmful contaminants. Washing raw fruits and vegetables with potable water helps to remove dirt, debris, and potentially harmful bacteria or other pathogens that may be present on the surface of the produce.
It is important to avoid using non-potable water, which may contain harmful chemicals or bacteria that can contaminate the produce. Sanitizer or natural fruit and vegetable juice should also not be used to wash raw fruits and vegetables as they may leave residues that could be harmful if ingested.
Therefore, the correct option is (c).
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Today's atmospheric CO2 concentration is _____.A. about the same as it was before 1850B. about 35% lower than it was before 1850C. about 35% higher than it was before 1850D. nearly 10 times higher than it was before 1850
Compared to before 1850, the atmospheric [tex]CO_2[/tex] content is around 35% higher today. Here option C is the correct answer.
Before the industrial revolution, which began in the mid-19th century, the concentration of [tex]CO_2[/tex] in the atmosphere was around 280 parts per million (ppm). However, due to the burning of fossil fuels such as coal, oil, and gas, which release carbon dioxide into the atmosphere, the concentration has been steadily increasing.
In May 2021, the atmospheric [tex]CO_2[/tex] concentration reached a new high of 419 ppm, which is nearly 50% higher than pre-industrial levels. This increase in [tex]CO_2[/tex] concentration has significant implications for the Earth's climate system, as carbon dioxide is a greenhouse gas that traps heat in the atmosphere and contributes to global warming.
The rise in temperature caused by this increase in [tex]CO_2[/tex] concentration has led to a range of impacts, including more frequent and severe heatwaves, droughts, and wildfires, as well as sea level rise, melting glaciers and ice sheets, and changes in weather patterns. It is therefore crucial that we take action to reduce our greenhouse gas emissions and limit the amount of [tex]CO_2[/tex] that we release into the atmosphere.
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More diverse communities are often less variable, but more resistant to disturbances
Diversity within communities refers to the variety of species present, and it is often considered to be a key indicator of ecological health. They are dependable and resistant to disruptions.
In general, more diverse communities tend to be more stable and resistant to disturbances, such as invasive species or climate change. However, research has shown that communities with high levels of diversity can also be more variable, with fluctuations in the abundance of different species over time.
In contrast, less diverse communities may be more stable over time, but they may also be less able to adapt to changes or disturbances. Overall, it is important to balance diversity and stability when managing ecosystems, and to consider the potential trade-offs associated with different management strategies.
Maintaining a healthy level of diversity in communities is crucial for the long-term resilience and sustainability of ecosystems.
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The most probable question would be:
Are more diverse ecosystems communities more or less resilient to disturbances?
All living things need carbon. How does carbon enter the living portion of an ecosystem?A. Elemental carbon taken in by plant rootsB. Atmospheric CO2 taken in by soil bacteriaC. Atmospheric CO2 taken in by photosynthesisD. Elemental carbon taken in by plant leaves
All living things need carbon enter the living portion of an ecosystem by Atmospheric CO2 taken in by photosynthesis, option C.
A crucial component of the Earth system is carbon. It is a fundamental component of all biological stuff on Earth and a crucial factor in controlling the planet's temperature. In a cycle known as the carbon cycle, carbon travels from the atmosphere to the land, ocean, and life through biological, chemical, geological, and physical processes. Changes in the carbon cycle that increase the amount of carbon in the atmosphere warm the temperature of Earth since some carbon gases are greenhouse gases.
The carbon cycle is most apparent in life on a short time scale. Photosynthesis is a process used by both terrestrial and aquatic plants to convert carbon dioxide into biomass, such as leaves and stems. When plants rot, are eaten, and are digested by animals, the carbon is released back into the atmosphere.
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ghrelin is a peptide hormone that: a. stimulates satiety. b. decreases eating behavior. c. stimulates eating behavior. d. serves as an antagonist to hunger.
Ghrelin, popularly known as "the hunger hormone," is a gastric peptide hormone that controls food intake, body weight, as well as taste perception, reward, cognition, learning, and memory.
What causes ghrelin to be released?Growth hormone secretagogue receptor (GHS-R) is activated by the multifunctional gut hormone ghrelin. The stimulatory effects of ghrelin on food intake, fat storage, and growth hormone release are its distinctive biological properties. The "hunger hormone" ghrelin is well-known. Ghrelin is a hormone that is produced by enteroendocrine cells in the gastrointestinal tract, namely the stomach. It is frequently referred to as the "hunger hormone" since it makes people more likely to want to eat. When hungry, ghrelin levels in the blood are at their peak; they then decline after meals. Ghrelin is impacted by the things you eat. For instance, eating foods strong in protein or good carbs lowers ghrelin levels more than eating foods high in fat. Your stomach produces the hormone known as ghrelin.To learn more about Ghrelin, refer to:
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Question 31
The variety of rat most common in the US in urban environments is:
a. black rat
b. brown rat
c. roof rat
d. white rat
The variety of rat most common in the US in urban environments is roof rat. Option C is correct.
The roof rat , also known as the black rat, ship rat, or house rat, is the variety of rat most commonly found in urban environments in the United States. Roof rats are medium-sized rodents that have a slender body, large ears, and a long, thin tail.
Roof rats are primarily nocturnal and are known to cause damage to property by gnawing on structures, wires, pipes, and stored food. They can also transmit diseases to humans and animals through their saliva, urine, and feces, posing a potential health risk.
Controlling roof rat populations typically involves implementing integrated pest management (IPM) strategies, such as exclusion, trapping, and sanitation measures, in order to prevent their entry into buildings and eliminate their food and water sources.
Hence, C. is the correct option.
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What does EtBr do in Electrophoresis of Plasmid pGLO DNA
Ethidium bromide (EtBr) is a fluorescent dye that is commonly used in the electrophoresis of plasmid pGLO DNA. In electrophoresis, DNA fragments are separated based on their size by running an electric current through a gel matrix.
When the gel is stained with EtBr, it intercalates between the DNA base pairs and fluoresces under UV light. This allows for the visualization of the DNA bands.
EtBr has the ability to intercalate between the base pairs of DNA, causing the DNA to unwind and shift in conformation. This causes a decrease in the electrophoretic mobility of the DNA fragments, which results in a more accurate separation of the fragments based on size. EtBr also helps to stabilize the DNA during the electrophoresis process, preventing it from breaking down or being degraded.
However, it is important to handle EtBr with caution as it is a potential mutagen and carcinogen. Proper safety protocols should be followed to prevent exposure to the dye. Alternatives to EtBr, such as SYBR Safe, are available and should be considered safer alternatives.
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if a shrew weighing 6.5 grams has a basal metabolic rate of 35 calories per hour per gram, how many kilocalories must it consume in one day to fuel its resting metabolism? group of answer choices 4.46 kilocalories 846.5 kilocalories 5,460 kilocalories 5.46 kilocalories 9.48 kilocalories
5.46 kilocalories is the closest alternative. The answer is 5.46 kilocalories as a result.
Calculation-The shrew weighs grammes, so first convert that to kilogrammes:
6.5 grams = 0.0065 kilograms
Next, determine how much energy is required each day for the shrew's resting metabolism:
35 calories/hour/gram x 0.0065 kg x 24 hours = 5.796 kilocalories
A healthy resting metabolism is what?RMR typically varies from 1,200 to 2,000 kcal per day (1,400 to 1,600 kcal per day for the majority of adults). Because they have more bulk to support, heavier persons have greater RMR. A pound of muscle uses 6-7 kcal each day. Only when our energy expenditure exceeds our calorie intake does weight loss occur.
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What is Tibialis Posterior (Insertion and Innervation)?
The Tibialis Anterior is a muscle located in the front of the lower leg.
Its insertion is the medial cuneiform and the base of the first metatarsal bone. It is innervated by the deep peroneal nerve. The primary function of the Tibialis Anterior is dorsiflexion and inversion of the foot at the ankle joint. It is also involved in stabilizing the ankle during walking and running.
Additionally, this muscle plays a role in controlling the deceleration of the foot during the swing phase of gait. Dysfunction or weakness of the Tibialis Anterior can lead to foot drop, a condition where the foot is unable to dorsiflex and the toes point towards the ground, making it difficult to walk normally.
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What is the term to describe the mass of chewed food mixed with saliva?
Scientists have found evidence that about 2.4 million years ago a gene regulating jaw muscles mutated and may have led to the more graceful human jaw we see today. The diagram below shows the skulls of Australopithecus
afarensis and modern-day human.
Which statement below most closely explains the link between jaw size and hominid evolution?
A. The jaws of hominids evolved to be smaller and less protruding over time.
B. The jaws of hominids evolved to be larger and more protruding over time.
C. There appears to be no change in the jaws of hominids over time.
D. The jaws of hominids changed over time due to a change in brain size
A gene mutation regulating jaw muscles 2.4 million years ago may have led to the smaller and more graceful human jaw (option a).
Scientists have discovered evidence that a gene mutation occurred 2.4 million years ago which regulated the jaw muscles and may have resulted in the more elegant and refined human jaw that we see today.
The diagram of Australopithecus afarensis and modern human skulls shows that hominids evolved to have smaller and less protruding jaws over time.
The mutation may have been caused by changes in diet or the development of tools, which led to a decreased need for strong jaw muscles.
The jaw size change was not due to brain size, and there was a clear trend towards smaller and more refined jaws over time in hominid evolution.
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In this case, the heterozygous phenotype is somewhat in the middle as far a gene expression.
It is possible that the heterozygous phenotype exhibits an intermediate expression of the trait when compared to the homozygous dominant and homozygous recessive phenotypes.
This pattern is known as incomplete dominance, where neither allele is dominant and the phenotype of the heterozygote falls somewhere in between the two homozygotes. For example, in snapdragons, the homozygous dominant genotype produces red flowers, the homozygous recessive genotype produces white flowers, and the heterozygous genotype produces pink flowers, which is a blend of the red and white color.
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what are things that affect energy storage molecules
Answer:
When there is more sunlight, producers can make more energy. When there is less sunlight, producers cannot make as many energy from the carbon in carbon dioxide.
Explanation:
what phase change occurs during the process of transpiration?
(middle school)
Answer: Evaporation
Transpiration is evaporation of liquid water from plants and trees into the atmosphere.
Describe the relationship between states of acidity and alkalinity and potassium in the body
The relationship between acidity, alkalinity, and potassium in the body is vital for maintaining proper pH levels, which is essential for optimal physiological functioning.
The relationship between states of acidity and alkalinity and potassium in the body is essential for maintaining proper physiological functions. Acidity and alkalinity are measured on the pH scale, where a lower pH indicates acidic conditions and a higher pH indicates alkaline conditions. The body's optimal pH range is slightly alkaline, around 7.35 to 7.45. Potassium is an important electrolyte that plays a crucial role in regulating the body's acid-base balance. It does this by working in concert with other electrolytes, such as sodium and bicarbonate, to maintain the appropriate pH levels in blood and tissues. An imbalance in potassium levels can lead to either acidosis (excess acidity) or alkalosis (excess alkalinity), both of which can have adverse effects on the body's overall health.
In summary, the relationship between acidity, alkalinity, and potassium in the body is vital for maintaining proper pH levels, which is essential for optimal physiological functioning.
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Which term is associated with asexual reproduction but not sexual
reproduction?
O A. Conjugation
O B. Fission
O C. Gamete formation
O D. Fertilization
SUBM
Fission term is associated with ase.xual reproduction but not se.xual reproduction.
The correct option is B .
In general , Fission is a type of ase.xual reproduction in which a single parent organism divides into two or more individuals of approximately equal size. Each new individual contains a copy of the parent's genetic material and is genetically identical to the parent.
During fission, the parent organism undergoes cell division, and each new individual formed contains a copy of the parent's genetic material. The new individuals are genetically identical to the parent and to each other. on the other hand During sex.ual reproduction, the genetic material from each parent combines to produce offspring that are genetically unique.
Hence , B is the correct option
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Roots comprise a greater proportion of net primary production in an ecosystem than their production of overall standing biomass
In an ecosystem, roots contribute more to net primary production than they do to total standing biomass output. True.
The tropical rain forests, which have a thick and evergreen vegetation, are the most productive ecosystems. It has a net primary production of 9000 kcal per square meter per year and is productive all year round. The state of the ecosystem is closely correlated with net primary production (NPP).
The highest NPP will be found in ecosystems where the conditions are most favorable for plant development. In this context, the term "favorable" refers to the existence of suitable and sufficient amounts of sunshine, temperature, water, and nutrients. Production of biomass. The term "net primary production" (NPP) is most frequently used interchangeably and is formally defined as the difference between the energy fixed by autotrophs and their respiration.
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Correct Question:
Roots comprise a greater proportion of net primary production in an ecosystem than their production of overall standing biomass. State true or false.
The mucous membrane (mucosa) of the _____________ and the _____________ intestines contain glands the secrete gastric or intestinal juices for _______________. Once digested, nutrients move into the cells of the body using the blood _______________ and lacteals within the villi of the small intestine.
The mucous membrane (mucosa) of the stomach and the small intestines contain glands that secrete gastric or intestinal juices for digestion. Once digested, nutrients move into the cells of the body using the blood vessels and lacteals within the villi of the small intestine.
Once nutrients are broken down and absorbed, they enter the bloodstream and are transported to cells throughout the body for energy and growth. The villi within the small intestine increase the surface area available for absorption, and blood vessels and lacteals within the villi allow for efficient nutrient uptake. The mucosa of the gastrointestinal tract plays a crucial role in maintaining overall health and well-being.
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the unique anatomical features of robust australopithecines suggest they were __________.
The unique anatomical features of robust australopithecines suggest they were adapted to a diet of tough, fibrous plant material. These features include their heavily built jaws and teeth, which were able to withstand the high forces needed to grind down tough plant material.
Additionally, their flared cheekbones and sagittal crest provided an additional surface area for the attachment of powerful chewing muscles.
It is believed that the robust australopithecines lived during a time when there was a shift towards more open habitats and a decrease in the availability of fruit.
In order to survive in this changing environment, they likely relied on a diet of tough, fibrous plants, which required a significant amount of chewing and grinding. Their unique adaptations allowed them to efficiently process these tough plant materials and thrive in their environment.
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Linked-list insertion may have overlapping neighborhoods that restrict parallelism.true/false
True. Linked-list insertion operations may involve modifying nodes that have overlapping neighborhoods, which can restrict parallelism and lead to potential data hazards.
Therefore, careful synchronization techniques must be employed to ensure correct and efficient insertion in a concurrent setting.
False. In a linked-list insertion, overlapping neighborhoods do not restrict parallelism. The process of insertion involves adding a new element to the list without affecting the existing elements. Parallelism can still be achieved by carefully managing access to the shared data structures.
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What are the six main things that happen in the boil?
The six main things that happen in the boil are sanitization, hop addition, evaporation, coagulation of proteins, maillard reactions, and extraction of sugars and other compounds.
In sanitization, the boil kills off any harmful bacteria or microorganisms present in the wort, ensuring a clean fermentation process. Hop addition are added at various stages during the boil to provide bitterness, flavor, and aroma to the beer. Water evaporates during the boil, which concentrates the wort and helps achieve the desired original gravity for the beer.
In coagulation, proteins in the wort coagulate and form clumps called "trub," which can be removed after the boil to promote clarity and stability in the finished beer. Maillard reactions are the chemical reactions between amino acids and reducing sugars occur during the boil, contributing to the color and flavor development in the beer. Sugars and other compounds from the malt are extracted and dissolved into the boiling water, creating the basis for the final beer's body, color, and flavor profile.
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Brown male bull produces white offspring. What is the genotype of the female cow? Of male bull? Of baby cow? Brown color is dominant
Since the male bull produces white offspring, it must be homozygous recessive for the brown color gene (bb). The genotype of the baby cow must be heterozygous for the brown color gene (Bb).
The color of an animal is determined by its genotype, which is a combination of two alleles inherited from its parents. In this case, brown color is dominant, and white color is recessive. Therefore, a brown cow can either be homozygous dominant (BB) or heterozygous (Bb), while a white cow must be homozygous recessive (bb).
Since the male bull produces only white offspring, it must be homozygous recessive (bb). Therefore, it can only pass on the recessive b allele to its offspring. The baby cow, which is white, must have received one b allele from its father and one B allele from its mother, who could be either heterozygous (Bb) or homozygous recessive (bb).
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Click and drag each word or phrase on the left to complete the sentences on the right. Then click and drag the sentences arranging them in order to accurately describe the involuntary micturition reflex. The fullness of the _____ is detected by _____ Voiding of the bladder is delayed by voluntary control of the _____. Sensory nerve impulses travel along the _____to the _____ spinal cord. Production of urine by the _____ begins to fill the urinary bladder. Efferent impulses excite the _____ and relax the_____.
Stretch receptors in the urinary bladder wall are responsible for sensing urine bladder fullness. The pelvic nerve carries sensory nerve impulses to the sacral spinal cord. The kidneys' production of urine starts to fill the bladder.
The external urethral sphincter's voluntary control prevents the bladder from emptying prematurely. Efferent impulses cause the internal urethral sphincter to relax and the detrusor muscle to contract.
In response to the stretch of the bladder wall, the sensory nerve fibers send signals to the sacral spinal cord. This initiates a spinal reflex that causes the detrusor muscle to contract and the internal urethral sphincter to relax. At the same time, the external urethral sphincter remains contracted, allowing urine to be stored in the bladder until it is voluntarily released.
When the decision is made to urinate, efferent nerve fibers from the brain signal the external urethral sphincter to relax, allowing urine to flow out of the body through the urethra. The involuntary micturition reflex is a complex process that involves the coordination of multiple structures and nerve pathways in the body.
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A person whose platelet count is 40,000/μl is suffering from
A) leukocytosis.
B) leukopenia.
C) thrombocytopenia.
D) hemocytosis.
E) thrombocytosis.
Explain why bone marrow cells were used as a source of stem cells (2)
As they are plentiful, diverse, and easily accessible, bone marrow stem cells are a favored source of stem cells and are perfect for a variety of therapeutic uses.
For numerous reasons, bone marrow cells are a typical source of stem cells: Stem cells in abundance: Bone marrow is a viable source for cell-based treatments because it includes a large number of stem cells. There are other kinds of stem cells in the bone marrow as well.
Simple accessibility: A very simple and less invasive source of stem cells is bone marrow. The stem cells can be extracted from either the patient's own bone marrow or the bone marrow of a donor, lowering the chance of rejection and other transplant-related issues.
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