61) Which of the following gases has the highest partial pressure in saturated alveolar air?

A) oxygen

B) nitrogen

C) water vapor

D) carbon dioxide

E) carbon monoxide

62) Which of the following has the lowest partial pressure in inhaled dry air?

A) oxygen

B) nitrogen

C) water vapor

D) carbon dioxide

E) mercury

63) Decompression sickness is a painful condition that results in ________ gas coming out of solution in the bloodstream.

A) oxygen

B) hydrogen

C) nitrogen

D) carbon dioxide

E) carbon monoxide

64) Normal interstitial fluid has a of 40 mm Hg and of 45 mm Hg. As a result,

A) both oxygen and carbon dioxide diffuse into the capillaries.

B) both oxygen and carbon dioxide diffuse out of the capillaries.

C) no diffusion occurs.

D) oxygen diffuses out of the capillaries and carbon dioxide diffuses in.

E) oxygen diffuses into the capillaries and carbon dioxide diffuses out.

65) About how much of the oxygen content of arterial blood consists of oxygen molecules in solution?

A) 50%

B) 25%

C) 10%

D) 5%

E) 1.5%

66) The illness characterized by shortness of breath resulting from loss of respiratory membrane surface for gas exchange is ________.

A) emphysema

B) asthma

C) lung cancer

D) pneumonia

E) cystic fibrosis

67) A chronic, progressive condition characterized by shortness of breath and destruction of alveolar surfaces and inadequate surface area for gaseous exchange is termed

A) cystic fibrosis.

B) emphysema.

C) asthma.

D) pneumonia.

E) lung cancer.

68) Most of the carbon dioxide transported by the blood (approximately 70%) is

A) dissolved in plasma.

B) bound to hemoglobin.

C) ultimately transported as bicarbonate ions in the plasma.

D) bound to the same protein as carbon dioxide.

E) carried by white blood cells.

69) The amount of oxygen bound (or released) by hemoglobin depends primarily on which of the following?

A) of its surroundings

B) of its surroundings

C) the carbonic anhydrase available

D) of its surroundings

E) the effect of the chloride shift

70) The enzyme carbonic anhydrase causes what to occur in RBCs?

A) carbon dioxide to be converted to carbonic acid

B) carbon dioxide to be converted to water

C) water to be converted to oxygen and carbon dioxide

D) water to react with hydrogen ions

E) carbonic acid to be converted to hemoglobin