The ventilation/perfusion ratio ________.
A. increases when blood flow is decreased
B. is lowest at the apex of the lungs
C. increases due to dilation of the pulmonary arterioles
D. decreases when ventilation is increased
Answer: A
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Feedforward regulatory processes
A. maximize fluctuations in the regulated variable. B. work in anticipation of changes in regulated variables. C. are identical to positive feedback processes. D. lead to instability of the regulated variable. E. tend to force physiological variables away from their set point.
Large proteins and red blood cells normally pass freely through the filtration membrane.
Answer the following statement true (T) or false (F)
Muscles needed for endurance require ________ than do less demanding muscles.
A. more nerves B. a richer blood supply C. less mass D. more heat
In what type of axon does saltatory conduction occur?