The popliteal region is the ________.
A. calf
B. hollow behind the knee
C. neck
D. armpit
E. thigh
Answer: 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.
Which of these would you not find in the cerebral cortex?
A) cell bodies B) dendrites C) unmyelinated axons D) fiber tracts
In what segment of the nephron is the greatest fraction of filtered water reabsorbed?
A. the proximal tubule B. the ascending limb of the loop of Henle C. the distal convoluted tubule D. the collecting ducts E. the descending limb of the loop of Henle
As an electrical impulse travels down the electrical conduction system, it transiently slows at the:
A. AV node. B. bundle of His. C. sinoatrial node. D. interatrial septum.