During a physical examination, Joe learns that his resting tidal volume is 550 mL; his average resting respiratory rate is 15 breaths per minute; his total lung capacity is 6000 mL; and his anatomic dead space is 150 mL
Joe's resting alveolar ventilation is:
A. 72.0 L/min
B. 6.0 L/min
C. 4.2 L/min
D. 1.8 L/min
E. 0.5 L/min
B
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When a depolarizing graded potential makes the axon membrane depolarize to threshold,
a) ligand-gated Ca+2 channels close rapidly. b) voltage-gated Ca+2 channels open rapidly. c) ligand-gated Na+ channels close rapidly. d) voltage-gated Na+ channels open rapidly. e) none of these choices occur.
Acetylcholine slows the heart rate by
A) increasing the permeability to K+ and decreasing the permeability to Ca2+. B) just increasing the permeability to K+. C) just increasing ion influx, thus increasing the rate of depolarization. D) just decreasing the permeability to Ca2+. E) just increasing the permeability to Ca2+.
The B vitamins are
A) essential for normal cellular metabolism. B) all of the above. C) grouped because they are in the same foods. D) involved in the oxidation of carbohydrates, lipids, and proteins.
A joint that occurs around two axes situated at right angles to each other is a(n) ________joint
Fill in the blank(s) with the appropriate word(s).