A sudden increase in pressure within the carotid sinus leads to
a. increased sympathetic nerve activity.
b. increased sympathetic nerve activity and decreased parasympathetic nerve activity.
c. decreased sympathetic nerve activity and increased parasympathetic nerve activity.
d. decreased sympathetic nerve activity.
e. none of these answers.
C
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Which of the following is not a membranous organelle?
A. Mitochondria B. Ribosome C. Nucleus D. Endoplasmic reticulum E. Golgi complex
Which of the following is/are found only in the PNS?
A. Nerves B. Astrocytes C. Unmyelinated axons D. Myelin E. Lipofuscin
Why are action potentials sometimes described as being "all-or-none" in character?
A. The rate of propagation of an action potential down an axon is independent of stimulus strength. B. They are associated with an absolute refractory period. C. A supra-threshold stimulus is required to stimulate an action potential during the relative refractory period. D. An action potential occurs whenever a suprathreshold stimulus occurs, and its amplitude does not vary with the size of a stimulus, as long as the membrane is not in the refractory period. E. Action potentials are always the same size, even when ion gradients vary in size.
Sympathetic nerve fibers trigger the secretion of nitric oxide, which dilates the deep arteries allowing blood to engorge the penis
Indicate whether the statement is true or false