Neuropeptides
a. are sometimes co-secreted along with classical neurotransmitters
b. are synthesized in the cytosol of the axon terminal
c. act at the subsynaptic membrane of the postsynaptic neuron
d. act slowly to bring about an IPSP or EPSP
e. are larger molecules than classical neurotransmitters
A
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Identify the FALSE statement.
A) Between nodes of Ranvier, signal conduction is decremental. B) The voltage-gated sodium and potassium channels begin to open during the depolarization. C) The amplitude of the action potential depends on the amplitude of the graded potential that precedes it. D) Under normal conditions, all action potentials in a given cell are identical.
Norepinephrine (NE) is released from sympathetic fibers in response to a sudden drop in mean arterial pressure (MAP). What does NE do to help return MAP to normal?
A. NE release increases total peripheral resistance leading to an increase in MAP B. NE acts on cells of the SA node to increase contractility C. NE release at ventricular cells increases the force of contraction and decreases the duration of systole D. NE stimulates the release of epinephrine from the adrenal medulla E. NE released at the SA node increases the slope of the pacemaker potential F. NE causes vasodilation of many arterioles leading to increased MAP
Systole refers to
A. contraction. B. stimulation. C. relaxation.