The velocity of action potential propagation:
a) is independent of an axon"s diameter.
b) depends on the thickness of the myelin around the axon.
c) will be unaffected if the axon becomes demyelinated.
d) is fastest in unmyelinated axons.
Regarding the sympathetic division of the autonomic nervous system:
a) acetylcholine is secreted by some sympathetic postganglionic fibers.
b) most sympathetic preganglionic fibers secrete norepinephrine (noradrenaline).
Regarding the hormones of the adrenal gland.
a) The adrenal gland secretes both peptide and steroid hormones.
b) Aldosterone plays a role in the regulation of plasma calcium.
c) The secretion of cortisol lowers plasma glucose levels.
d) The ad
Question 19. Concerning the mechanics of ventilation:
a) The change in the volume of the lungs with pressure is a measure of
b) The total compliance of the chest is determined solely by the compliance of the
c) The recoil of the l