A) oxygen.
B) water vapor.
C) argon.
D) nitrogen.
E) carbon dioxide.
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A) 30 mm Hg
B) 100 mm Hg
C) 70 mm Hg
D) 104 mm Hg
E) all of these
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A) in gaseous form.
B) in blood plasma.
C) as carbaminohemoglobin.
D) as bicarbonate ions.
E) as carbonic acid.
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A) All respiratory surfaces must be kept moist.
B) The amount of gas diffusing across a respiratory membrane is dependent upon the surface area and the partial pressure of each gas.
C) The surface area of a growing cell increases at the same rate as its volume.
D) Ventilation maintains partial pressure gradients between the atmosphere and the lungs.
E) Breathing and ventilation are equivalent in respiration.
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A) muscle cramps.
B) neural signal disruption.
C) euphoria.
D) drowsiness.
E) weakness.
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A) 1
B) 2
C) 3
D) 4
E) 5
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A) exocytosis and endocytosis.
B) facilitated diffusion.
C) osmosis.
D) simple diffusion.
E) active transport.
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A) the pH is low.
B) the tissues are warmer.
C) the partial pressure of O2 is low.
D) the partial pressure of CO2 is high.
E) all of these occur.
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A) the diaphragm relaxes.
B) the intercostal muscles relax.
C) the pressure in the lungs increases.
D) the lung volume decreases.
E) all of these occur.
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A) is a protein.
B) is a pigment.
C) stores oxygen.
D) has an affinity for oxygen.
E) is composed of multiple protein chains.
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A) It is a leading cause of lung cancer.
B) The lungs become elastic.
C) It can lead to emphysema.
D) The alveoli shrink.
E) All of these are true.
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