Answers
Answer:
The nose consists of the visible external nose and the internal nasal cavity. The nasal septum divides the nasal cavity into right and left sides. Air enters two openings, the external nares (nostrils; singular, naris), and passes into the vestibule and through passages called meatuses. The bony walls of the meatuses, called concha, are formed by facial bones (the inferior nasal concha and the ethmoid bone). From the meatuses, air then funnels into two (left and right) internal nares. Hair, mucus, blood capillaries, and cilia that line the nasal cavity filter, moisten, warm, and eliminate debris from the passing air.
The pharynx (throat) consists of the following three regions, listed in order through which incoming air passes:
The nasopharynx receives the incoming air from the two internal nares. The two auditory tubes that equalize air pressure in the middle ear also enter here. The pharyngeal tonsil (adenoid) lies at the back of the nasopharynx.
The oropharyrnx receives air from the nasopharynx and food from the oral cavity. The palatine and lingual tonsils are located here.
The laryngopharynx passes food to the esophagus and air to the larynx.
The larynx receives air from the laryngopharynx. It consists of several pieces of cartilage that are joined by membranes and ligaments, shown in Figure 2:
The epiglottis, the first piece of cartilage of the larynx, is a flexible flap that covers the glottis, the upper region of the larynx, during swallowing to prevent the entrance of food.
The thyroid cartilage protects the front of the larynx. A forward projection of this cartilage appears as the Adam's apple (anatomically known as the laryngeal prominence).
The paired arytenoid cartilages in the rear are horizontally attached to the thyroid cartilage in the front by folds of mucous membranes. The upper vestibular folds (false vocal cords) contain muscle fibers that bring the folds together and allow the breath to be held during periods of muscular pressure on the thoracic cavity (straining while defecating or lifting a heavy object, for example). The lower vocal folds (true vocal cords) contain elastic ligaments that vibrate when skeletal muscles move them into the path of outgoing air. Various sounds, including speech, are produced in this manner.
The cricoid cartilage, the paired cuneiform cartilages, and the paired corniculate cartilages are the remaining cartilages supporting the larynx.
The trachea (windpipe) is a flexible tube, 10 to 12 cm (4 inches) long and 2.5 cm (1 inch) in diameter (Figure 2).
The mucosa is the inner layer of the trachea. It contains mucus‐producing goblet cells and pseudostratified ciliated epithelium. The movement of the cilia sweeps debris away from the lungs toward the pharynx.
The submucosa is a layer of areolar connective tissue that surrounds the mucosa.
Hyaline cartilage forms 16 to 20 C‐shaped rings that wrap around the submucosa. The rigid rings prevent the trachea from collapsing during inspiration.
The adventitia is the outermost layer of the trachea. It consists of areolar connective tissue.
The primary bronchi are two tubes that branch from the trachea to the left and right lungs.
Inside the lungs, each primary bronchus divides repeatedly into branches of smaller diameters, forming secondary (lobar) bronchi, tertiary (segmental) bronchi, and numerous orders of bronchioles (1 mm or less in diameter), including terminal bronchioles (0.5 mm in diameter) and microscopic respiratory bronchioles. The wall of the primary bronchi is constructed like the trachea, but as the branches of the tree get smaller, the cartilaginous rings and the mucosa are replaced by smooth muscle.
Alveolar ducts are the final branches of the bronchial tree. Each alveolar duct has enlarged, bubblelike swellings along its length. Each swelling is called an alveolus. Some adjacent alveoli are connected by alveolar pores.
The respiratory membrane consists of the alveolar and capillary walls. Gas exchange occurs across this membrane. Characteristics of this membrane follow:
Type I cells are thin, squamous epithelial cells that constitute the primary cell type of the alveolar wall. Oxygen diffusion occurs across these cells.
Type II cells are cuboidal epithelial cells that are interspersed among the type I cells. Type II cells secrete pulmonary surfactant (a phospholipid bound to a protein) that reduces the surface tension of the moisture that covers the alveolar walls. A reduction in surface tension permits oxygen to diffuse more easily into the moisture. A lower surface tension also prevents the moisture on opposite walls of an alveolus or alveolar duct from cohering and causing the minute airway to collapse.
Alveolar macrophage cells (dust cells) wander among the other cells of the alveolar wall, removing debris and microorganisms.
Related Questions
how does activation energy influence a reaction
Answers
Answer: The activation energy of a particular reaction determines the rate at which it will proceed. The higher the activation energy, the slower the chemical reaction will be. The example of iron rusting illustrates an inherently slow reaction.
Explanation:
HELP PLZZZZZZZZZZZZZ I WILL GIVE BRAINLIST!!!!!!!!!!!
If you place Alka -Seltzer tablets in a closed container of water, the tablets effervescence then produce a gas. What will eventually happen inside this closed container?
A. Not enough information to determine.
B. The pressure decreases.
C. The pressure increases.
D. The pressure remains the same.
Answers
Answer:
c the pressure increases
How many molecules of nitrogen dioxide NO2 are in 1 mole of NO2?
Answers
Answer:
The answer is 46.0055. We assume you are converting between grams NO2 and mole. You can view more details on each measurement unit: molecular weight of NO2 or mol This compound is also known as Nitrogen Dioxide.
Explanation:
hope this helps
Find the number of moles if you have 1.2 x 1048 copper atoms.
Answers
Answer:
1.993 × 10^(24) moles
Explanation:
From avogadro's number, we have that;
1 mole of atoms contain 6.022 × 10^(23) atoms
Therefore, 1.2 x 10^(48) atoms of copper will contain;
(1.2 x 10^(48) × 1)/(6.022 × 10^(23)) = 1.993 × 10^(24) moles
which one of the following can be separated by physical means:
(a) element
(b) mixture
(c) compound
(d) radical
Answers
Answer:
B mixture can be separated by physical means
Answer:
this is compound ok or not
Write an informal definition of half-life.
Answers
the time required for the activity of a substance taken into the body to lose one half its initial effectiveness. Informal. a brief period during which something flourishes before dying out.
hope this helps ^^
What is meant by the dual wave-particle nature of light?
Answers
Dual wave particle nature of light can be regarded as mechanism that says light and matter will also has the properties of waves as well as that of particles.
This concept is found in mechanics as it describes how light and matter also has the properties associated with waves as well as particles.The duality explained inadequacy of conventional concepts of both wave and particle so as to give explanation about behaviour of quantum objects.the dual nature of light made us to understand that light has wave properties and it also has particle properties.Some of the properties of wave that light has are:
wavelengthspeedTherefore, duality means have both characteristics of light and wave
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HELPPP simply the expression!!!!
Answers
Answer:
[tex] \frac{3}{ \sqrt{3} } \times \frac{ \sqrt{3} }{ \sqrt{3} } = \frac{3 \sqrt{3} }{3} = \sqrt{3} [/tex]
when there is a radical in the denominator, we should rationalize (mutiply the denominator and numerator by the radical) to get rid of the radical in the denominator.
What three types of particles make up an atom? What are their charges?
Answers
Answer:
Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P." Neutrons have no electrical charge.
Answer:
Protons, positive charge
Neutrons, neutral
Electrons, negative charge
Explanation:
convert 100 ml to L can you help mee??
Answers
Answer:
0.1 L
Explanation:
divide the volume value by 1000
Answer:
0.1 L that is the answer
Explanation:
I searched it
Which formula below can be used to calculate speed?
Speed = Volume ÷ Mass
Speed = Time ÷ Distance
Speed = Mass x Acceleration
Speed = Distance ÷ Time
Answers
Answer:
The answer is Speed= Distance ÷ Time
Explanation:
To work out what the units are for speed, you need to know the units distance and time.
PLEASE HELP ASAP!!!
A teacher wrote the following part of a chemical equation involving water (H2O) and carbon dioxide (CO2): H2O + CO2 ---> ?
What is the most likely result of the chemical reaction represented by this equation?
A. H2CO3
B. NaCl
C. HNO3
D. H2Ca3
Answers
Answer:
Id say A. I think I hope I'm right
Can someone balance these equations?
Answers
This is mind numbing, but I got you.
3NaOH + 1FeCl3 = 1Fe(OH)3 + 3NaCl
3Mg + 2H3(PO)4 = 1Mg(PO4)2 + 3H2
What force pulled the solar system together out of a cloud of gas and dust
Answers
Approximately 4.5 billion years ago, gravity pulled a cloud of dust and gas together to form our solar system.
Explain why Chlorine has the largest electronegativity between Ne, Mg, Ba, Sb, Hg, Li?
Answers
Answer:
Look at the image provided and try work it out. I don't have the time but I hope I helped you!
Explanation:
how can a substance stay at a certain temperature even though it is being heated?
Answers
Assume that a 100-base pair DNA double helix contains 45 cytosine bases. Use logical thinking to figure out how many adenine bases there will be. Explain how you know.
Answers
Answer:
You will not be allowed to have any learning aids while taking a test or ... A DNA molecule consists of three parts—a nitrogen base, ... There are four DNA nucleotides, each with one of the four nitrogen bases (adenine, thymine, cytosine, and guanine). The DNA forms a two-stranded spiral, or double helix.
Explanation:
hope this helps ✌️
27.2Pb(NO3)2 --> 2Pb0 + 4NO2 + O2
O A. Synthesis
B. Single displacement
C. Decomposition
D. Combustion
Answers
how can acids cause chemical weathering
Answers
The acids react with the chemical composition of the rock causes the disintegration of the rocks.
Chemicals when react with the chemical components of the rocks cause the disintegration of the chemical and physical structure of rocks which cause breakage of rocks into parts. This process is called chemical weathering.
For example, the sulfur dioxide gas in the air reacts with the water in the air to form the acid rain.
The acid rain reacts with the chalk or limestone rock that causes the disintegration of the chemical structure and physical structure of rock causing breakage of the chalk or limestone.
Learn more about weathering:
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how many grams of sodium carbonate must react with 222 g of calcium chloride to make 233 grams of sodium chloride and 201 grams of calcium carbonate?
Answers
Answer: 212 g of sodium carbonate must react
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
The balanced chemical equation is:
[tex]Na_2CO_3+CaCl_2\rightarrow 2NaCl+CaCO_3[/tex]
Mass of products = mass of sodium chloride + mass of calcium carbonate = 233 g+ 201 g= 434 g
Mass of reactants= mass of sodium carbonate + mass of calcium chloride =x + 222 g
As the mass of reactants should be equal to mass of products
434 = x + 222 g
x = 212 g
Thus 212 g of sodium carbonate must react with 222 g of calcium chloride to make 233 grams of sodium chloride and 201 grams of calcium carbonate
Please help... giving a lot of points and awarding brainliest.
Answers
Percent Yield: 67.4%
Theoretical Yield of C2H6: 6.50
Percent Yield: 88.7%
Theoretical Yield of HF: 3.84
Percent Yield: 71.4%
To Identify a mineral, there are tests that are used including:
Answers
Geologists use the following tests to distinguish minerals and the rocks they make: hardness, color, streak, luster, cleavage and chemical reaction.
In Step 5, you will calculate H+/OH– ratios for more extreme pH solutions. Find the concentration of H+ ions to OH– ions listed in Table B of your Student Guide for a solution at a pH = 2. Then divide the H+ concentration by the OH– concentration. Record these concentrations and ratio in Table C. What is the concentration of H+ ions at a pH = 2? mol/L What is the concentration of OH– ions at a pH = 2? mol/L What is the ratio of H+ ions to OH– ions at a pH = 2? : 1
Answers
Answer:0.01
0.000000000001
10,000,000,000
Explanation:
Answer:
1. What is the concentration of H+ ions at a pH = 2?
0.01 mol/L
2. What is the concentration of OH– ions at a pH = 2?
0.000000000001 mol/L
3. What is the ratio of H+ ions to OH– ions at a pH = 2?
10,000,000,000 : 1
Have a wonderful day/night! :)
Is Mg(CH3COO)2 soluble or insoluble
Answers
Answer:
It is Soluble
Explanation:
Name- Magnesium acetate
It dissolves easily in water and alcohol.
35 points
What are the reactants and the products in this equation?
2H2 + O2 → 2H2O
a Reactants: water; Products: hydrogen, oxygen
b Reactants: hydrogen, oxygen; Products: water
Answers
Answer:
02 ;D h2oooooooooooo
long story shortB
Explanation:
Answer:
B
Explanation:
2H2→Hydrogen peroxide
O2→oxygen
"A water molecule (formally known as dihydrogen monoxide) is composed of two hydrogen atoms and one oxygen atom. ... The actual reaction to make water is a bit more complicated: 2H2 + O2 = 2H2O + Energy"
"A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction."
The answer is B, hope this helps :)
How is elevation shown on a topographic map?
O intermediate contours
O index contours
O contour intervals
Ocontour lines
Answers
Answer:
D. Contour lines.
Explanation:
The primary difference is that they show elevation in detail. Characteristics of topographic maps include: they show elevation using contour lines. Put simply, a contour line is a line which joins points of equal elevation above sea level.
Why does forming bonds release energy? *
Answers
The best description of the Big Bang Theory is ______________
A. The universe began with cold dense energy compressing into matter after which all matter and energy began rapidly contracting toward each other.
B. The universe began with hot dense energy compressing into matter after which all matter and energy began rapidly expanding away from each other.
C. The universe began with hot dense matter after which all energy began rapidly expanding away from each other.
D. The universe began with cold, spread out matter compressing into energy, after which all matter and energy began slowly moving toward each other
Answers
Answer:
B. the universe began with hot dense energy compressing into matter after which all matter and energy began to rapidly expanding away from each other.
hope it helps
What can be concluded from the statements above?
A. A harmful compound can become harmless when its elements are separated.
B. A harmless compound can become harmful when its elements are separated.
C. Breaking a compound into its separate elements has no noticeable effects.
D.Breaking a compound into its separate elements can create carbon dioxide.
Answers
Answer:
B
Explanation:
I am not sure why
Answer:
Yea I think B as well!!!!!
properties changes if the size of an object changes?
A.mass
B.volume
C.weight
D.all of the above
Answers
Answer:
D
Explanation:
The answer should be D, when the size of an object changes it changes how much mass it has how heavy it is (weight), and how much space it takes up (volume).