Exam 22: Gas Exchange

A) the distance between the air they breath in and the blood is decreased.
B) there is less pressure in the lungs to force the oxygen to dissolve in the blood.
C) the concentration of oxygen in the lungs becomes much greater than that in the blood.
D) their lungs have less surface area available for diffusion.

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A) They float freely in the liquid portion of human blood.
B) They increase the blood's ability to carry oxygen.
C) They are made of a complex protein bound to iron atoms.
D) They bind reversibly to oxygen.

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A) nearby red blood cells release carbon dioxide.
B) oxygen diffuses into red blood cells and binds to hemoglobin.
C) carbon dioxide diffuses into an alveolus.
D) oxygen diffuses out into the alveolus.

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A) have a higher concentration of oxygen than the surrounding cytosol.
B) lose oxygen by diffusion.
C) lose carbon dioxide by diffusion.
D) gain oxygen by being in direct contact with hemoglobin.

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A) when it is inside an alveolus
B) near red blood cells that are undergoing cellular respiration
C) at the terminal ends of bronchioles
D) near body cells that are undergoing cellular respiration

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A) Oxygen moves into cells by diffusion, but carbon dioxide is moved by active transport.
B) Oxygen and carbon dioxide move into and out of cells and alveoli passively by diffusion.
C) Carbon dioxide and oxygen are actively transported into and out of blood by diffusion.
D) Oxygen moves into cells by diffusion, but in the alveoli it is actively transported.

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A) carbon dioxide
B) alveoli
C) nodules
D) hemoglobin

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circulatory

A) The concentration of oxygen around the cell is constantly being lowered.
B) The concentration of oxygen around the cell causes more carbon dioxide to diffuse out of the cell.
C) The release of products of cellular respiration causes oxygen to diffuse into the blood plasma.
D) The carbon dioxide concentration outside the cell constantly decreases.

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A) muscle contraction requires oxygen to lessen the amount of ATP that is produced.
B) the amount of carbon dioxide required for cellular respiration increases.
C) the muscle cell mitochondria require more oxygen.
D) the surface area-to-volume ratio of the lungs decreases.

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C

A) a higher concentration of carbon dioxide than the air in an alveolus.
B) a higher concentration of both carbon dioxide and oxygen than an alveolus.
C) a higher concentration of oxygen and a lower concentration of carbon dioxide than in an alveolus.
D) a lower concentration of oxygen and carbon dioxide equal to the concentrations in an alveolus.

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A) the surface area of your lungs will be decreased.
B) the amount of hemoglobin in your blood will decrease.
C) hemoglobin will not be able to bind to oxygen as well at a higher altitude.
D) the amount of oxygen that could diffuse into your blood will be decreased.

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A) reduce water loss during gas exchange.
B) allow better uptake of carbon dioxide.
C) prevent the loss of oxygen during gas exchange.
D) allow more efficient production of carbohydrates.

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A

A) increased blood flow
B) increased concentration of hemoglobin in the blood
C) increased heart rate
D) increased attraction of hemoglobin to oxygen

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