Which of the following provides vascular tone?
a. acetylcholine.
b. dopamine.
c. GABA.
d. glycine.
e. norepinephrine.
E
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Action potentials are related to impulses conducted along an axon in that
A. propagation of a series of action potentials along a nerve fiber constitutes an impulse. B. active transport of Na+ and K+ are required for impulse conduction but not for an action potential. C. many impulses are required to cause one action potential. D. impulses are stronger responses than are action potentials.