Answer:
Influx of Na+ across the motor end plate resulting in the depolarization of the muscle fiber membrane
**because the influx of Na+ across the motor end plate occurs when Na+ ion channels bind the ligand acetylcholine.
a pharmaceutical company has developed a new weight loss drug for women. preliminary tests show that the drug seems to be fairly effective in about 75% of test subjects. the drug company thinks that the drug might be most effective in overweight women, but they are unsure to whom they should market the product.
use the scientific method to address the pharmaceutical company's needs:
4a. state a research question
4b. conduct online research on "body mass index" categories. record pertinent information and cite your sources
4c. construct a testable hypothesis
4d. design an experiment to test the hypothesis. be as specific as possible in describing what will be observed or measured
In this case, the scientific method can be used to confirm weight loss in 75% of cases by a preclinical assay.
What is a research question?A research question is a given question that can be solved by using the scientific method (e.g., can this drug be used to loss weight?).
A hypothesis is a given explanation of an observation from a question of the real world (in this case, the target drug is effective 75% of cases).
The experimental procedure, in this case, may involve taking two sample populations and supplying the target drug to one to observe if is statistically associated with weight loss.
In conclusion, in this case, the scientific method can be used to confirm weight loss in 75% of cases by a preclinical assay.
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Which blood vessels are primarily responsible for gas exchange? This is last quesion
Answer:
capillaries
Explanation:
gas exchange happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries
identify the cell parts that function in a similar way to the coal-fired power plant
Answer:
The Mitochondria
Explanation:
The mitochondria supply the energy for the cell by transforming sugars into energy as does a power company produce energy for the city.
Hope this helped!!
Astronomy
What are some of the differences between building the ISS to be sent out to space and building a large structure that will remain on Earth? Explore and discuss the differences and similarities in the challenges of constructing something on Earth versus something in space.
In the construction of the building of the ISS, the strength and mass of the materials used are put into consideration since there is less gravity in space.
What is space?Space is the space which is found outside the earth that is occupied and in which the planets and stars are found.
In building the ISS to be sent to space, the materials used are such that they will be able to withstand the collisions with particles found in space.
Consideration is also given to the mass since gravity is smaller in space than on earth.
However, both the ISS and buildings on earth are similar since they are built from materials.
Therefore, in the construction of the building of the ISS, the strength and mass of the materials used are pit into consideration since there is less gravity in space.
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Answer: In the construction of the building of the ISS, the strength and mass of the materials used are put into consideration since there is less gravity in space. After building, the ISS to be sent to space, the materials used are such that they will be able to withstand the collisions with particles found in space. Consideration is also given to the mass since gravity is smaller in space than on earth.
Explanation:
explain closely related but different
Please help me asp
The ______ is a colored membrane capable of contraction and expansion to allow more or less light through the pupil.
the united states builds between 2 and 5 new nuclear power plants each year for the past 20 years.
true or false
The nuclear power is a technology, providing 11 percent of electricity globally. This provides only one-fifth of America's electricity, and there are currently only five reactors under construction.
What is a nuclear power?The use of nuclear reaction to produce electricity is called as nuclear power.
It can be done either by nuclear fission, decay or fusion reactions mainly by uranium and plutonium.
As America has only 5 reactors under construction recently which provides one-fifth of America's electricity.
Thus, the given statement is false.
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What is the order of the 3 major climates zones moving from the North and South Poles towards the equator?
Tropical, Temperate, and Polar.
What is the independent variable in an experiment testing if caffeine affects the way common house spiders build webs?
a.the number of house spiders you give caffeine to
b. the amount of food you feed the house spiders
c. the body mass of each house spider
d. the amount of caffeine the house spiders receive
Answer:
d.
Explanation:
The independent variable in an experiment is the variable that is manipulated to test a hypothesis. In this case, that is caffeine. In order to study the effects, they have to give different amounts to spiders
The independent variable in an experiment testing if caffeine affects the way common house spiders build webs is the amount of caffeine the house spiders receive. The correct option is b.
What is variable?In science and research, a variable is any factor or condition that can be measured, controlled, or manipulated.
The independent variable is the variable that the researcher manipulates or changes in order to observe its effect on the dependent variable.
In this case, the researcher is interested in the effect of caffeine on the way house spiders build webs, so the amount of caffeine that the spiders receive is the independent variable.
The other options, such as the number of house spiders, the amount of food, or the body mass of the spiders, are not being intentionally manipulated in this experiment and therefore are not the independent variable.
Thus, the correct option is b.
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help me quick please i really need this
Answer:
White Dwarfs
Explanation:
White Dwarfs usually have stars that are between 8,000 K and 40,000 K.
Hope I helped.
:)
Lab: exercise and homeostasis lab report
if anyone has done this pls help
ill give brainliest
Introduction:
The question that was trying to be answered in this lab was “How does exercise affect a person’s heart rate, breathing rate, and perspiration level?” Based on this question, the hypothesis that was formed was “If effects of exercise and exercise are related, then exercising will increase heart rate, breathing rate, and perspiration level”.
What is homeostasis?Homeostasis refers to the mechanism of the body to maintain a stable internal environment instead of changes taking place in the external environment.
Homeostasis in the body is maintained through three vital organs, as mentioned before, the kidneys, liver, and brain. These regulate the temperature, iron content in our blood, retention, and production of energy and overall blood composition. This was helpful because the whole lab report was based on homeostasis and the effect that it had on exercise.
Materials and Methods:
1. Materials:
a. People to exercise
b. A clock or stop watch
2. Procedure:
Choose one volunteer to complete jumping jacks at a pace that can be maintained for eight minutes. Make sure the volunteer is inactive for a few minutes before the experiment begins.Measure the heart rate by taking his or her pulse, you can do this one of two ways: Radial Pulse, Carotid PulseMultiply the number of beats in 15 seconds by 4 to calculate the beats per minute. Record the data in the table below the 0 minutes box.Measure the person’s perspiration level from 0 to 5: (0 = none; 5 = droplets dripping down the face). Note this observation in the table. Have the volunteer do jumping jacks for 2 minutes. After 2 minutes, measure the heart rate, breathing rate, and perspiration level (refer to steps 2 through 5), and record the data. Measure the pulse, breathing and perspiration levels as quickly as you can so that the volunteer can resume exercise. Do not have volunteer wait while you do the calculations and enter the data. Repeat step 6 three more times (remember, 2 minutes each at a time, totaling 8 minutes) and record your data at each point. After the final recording of the dependent variables, wait one minute with the volunteer at reset. Then measure all of the variables again. Record this data under the “9 Time (Min.) Box”.Analysis:
There is an increase effect of exercise over time on the circulatory and respiratory systems, as shown in both Table 1 and Table 2. As the students began their exercise in two-minute intervals, their heart rates increased on average from 73 beats per minute to 115 beats per minute. Shawn’s individual heart rate began at 84 beats per minute, and after lifting 5-pound weights for 8 minutes, his heart rate increased to 114 beats per minute . Also, his breathing rate showed an increase from 36 breaths per minute to 44 breaths per minute.
Based on this data shown, the amount that you exercise does effect the circulatory and respiratory systems by causing a, on average, dramatic increase in beats/breath per minute in the measured variables.
Conclusion:
According to the data collected, the hypothesis that was developed at the beginning of the experiment: “If effects of exercise and exercise are related, then exercising will increase heart rate, breathing rate, and perspiration levels”; was accepted . Based on the data shown our individual group charts and the class averages, the effect that exercise has on the respiratory and circulatory systems is that it develops an increase in heart rate (Start: 73/ Finish: 115), breathing rate (Start: 38/ Finish: 56), and perspiration levels (Start: 0/ Finish: 1).
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What happens at a cellular level during organ rejection?
Answer:
The ability of recipient T cells to recognize donor-derived antigens called allorecognition initiates allograft.
What is the term for the disease whose symptoms includes pallor, shortness of breath, infection, bleeding gums, predominance of immature and abnormally functioning lymphocytes in a young child
Answer: acute lymphoid leukemia
Explanation: Acute lymphoblastic leukemia is the most common childhood cancer. It occurs when a bone marrow cell develops errors in its DNA.
Symptoms may include enlarged lymph nodes, bruising, fever, bone pain, bleeding from the gums, and frequent infections.
6 The primary function of a plant's roots is to
(1) absorb water
(2) perform photosynthesis
(3) produce seeds
Answer:
1
Explanation: The roots of seed plants have three major functions: anchoring the plant to the soil, absorbing water and minerals and transporting them upwards, and storing the products of photosynthesis.
18. What would happen to an organism that could not
keep homeostasis of its internal conditions?
Answer:
Death or disease
Explanation:
All of the organ systems of the body work together to maintain homeostasis of the organism. If homeostasis fails, death or disease may result.
How does the loss of leaves help a plant survive winter or long periods without rain?
Answer:
because It loses leaves so that it can keep all of the nutrients and water to the ruts and steam
Explanation:
It can always grow more leaves
The ______ states that energy always changes from high quality to low-quality forms.
A) Downstream
B) Meltdown
C) Turbine
D) Ethanol
E) Passive solar cooling
F) Utility
G) First Law of Energy
H) Refinery
I) Isotopes
J) Second Law of Energy
Answer:
J) Second Law of Energy
Explanation:
second law of thermodynamics. Scientific law stating that whenever energy is transformed from one type to another in a physical or chemical change, the result is a lower-quality or less usable energy.
2. Write the equation for photosynthesis here:
(d) State the end products of photosynthesis:
Answer:
The chemical equation for photosynthesis is 6CO2+6H2O→C6H12O6+6O2
The products of photosynthesis are glucose and oxygen.
hope this answer helps you.
What are the top two layers of a soil profile called?.
Answer:
Top two layers of a soil profile is: 1.Top soil and 2. Sub soil.
Explanation:
The soil is arranged in layers or horizons during its formation. These layers or horizons are known as the soil profile.
The different layers of soil are:
1.Topsoil
2.Subsoil
3.Parent rock
Which molecules are unable to pass through the phospholipid bilayer?
a
Sugar
b
Water
c
Oxygen
d
Protein
The molecules that are unable to pass through the phospholipid bilayer is sugar .
What is phospholipid bilayer?Phospholipid bilayer refer to a two thin layers which consists of hydrophobic head and hydrophilic tail which allow allow the inflow or outflow of gases and smaller substances in cells.
Therefore, The molecules that are unable to pass through the phospholipid bilayer is sugar .
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what does a stigma in a flower do?
Answer:
Part of the pistil where the pollen germinates
Explanation:
Stigma is the platform on which pollen grains land. Pollen drops on the stigma from where fertilization occurs. Stigma's main work is to basically receive the pollen, thus it has sticky surface.
Reduction and eventual increase in the size of populations
Explain these different adaptations:
Behavioral-
Structural-
Functional-
Explanation:
Behavioral adaptation:This is the actions animals/organisms survive.
Structural adaptation:This is the process animals/organisms adjust to live on any surroundings to survive.
Functional adaptation:It is the activity/working of animals/organisms.
When making bread,you add yeastand sugar, buti does not taste steet, why?
Answer:
You don't have enough sweet ingredients in the bread. The other ingredients outbalance the sweet ingredients
Explanation:
Answer:
Yeast is a fungus, and eats sugar for energy. When this occurs, carbon dioxide and fermentation occurs, in which the carbon dioxide is trapped within the bread, allowing for it to rise. If there is little to no sugar left after the bread is completed, then the bread will not taste sweet.
Where is energy storef in living systems
can u pls help me gosh 17 if u get it right
Answer:
The Answer is b
Explanation:
Chromosomes are duplicated.
What would happen to a compass if earth's magnetic field were to invert?
a.
the compass would point in the opposite direction.
b.
the compass would oscillate between magnetic north and magnetic south.
c.
the compass would not be affected.
d.
the answer depends on the strength of the magnetic field.
Scientists have determined that lactase persistence evolved independently in European and African populations. What do these populations have in common that could result in lactase persistence in both populations?
Which gland is responsible for the production of testosterone and sperm?.
Answer:
Testicles
Explanation:
male testicles produce testosterone and sperm
3. If a human produces 1 million proteins, but human DN only codes for 25,000 genes, on average how many proteins are produced per gene?
Answer:
40 protein produced each
Explanation:
take 1 million and divide it by 25,000, it should say 40
State four ways in which the mammalian skin responds to low temperature in the environment
When you're out in cold climate, your skin starts shivering so the blood vessels will acquire and keep you as warm as possible.
But if there's a heat wave, you'll sweat to increase the blood flow to the veins, which in turn increases perspiring. This process chills you off as the water disappears from your skin.
How does the skin respond to low temperature?If the skin temperature drops below 37°C, a variety of rejoinders are started in the skin to have the warmth within the body and to increase heat display . These include vasoconstriction, end of sweating, and erection of follicles to increase insulation.
Thus, this could be the answer.
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