If N2 gas comprises 79 percent of atmospheric air at sea level, what is PN2?
a. about 300 mm Hg
b. about 400 mm Hg
c. about 500 mm Hg
d. about 600 mm Hg
e. about 700 mm Hg
D
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Contraction and relaxation of smooth muscle in the wall(s) of ____ can alter its diameter and air flow
a. alveoli b. bronchioles c. bronchi d. trachea e. larynx
The embryonic germ layer of tissue in animals that develops into the skin and nervous system is the
A. mesoderm. B. protoderm. C. ectoderm. D. pachyderm. E. endoderm.
NAD is a(n)
A. enzyme. B. electron carrier. C. product of photosynthesis. D. oxygen carrier.
Why are ATPases associated with active transport proteins?
a. They allow for the production of ATP that is needed during active transport. b. They help pump phosphate ions across the membrane to maintain the electrochemical gradient. c. They provide transport proteins with the energy needed to pump molecules against their concentration gradients. d. They are important only in symport proteins, because two are required. e. All of the above