What are caveolae?
A. can rapidly develop action potentials
B. shallow invaginations of cell membrane
C. relatively constant tension maintained for a period of time
D. intracellular cytoskeleton
E. enzyme that removes phosphate from myosin
B
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If precapillary sphincters relax, local blood flow in the capillary bed ________; if this occurs in several capillary beds at the same time, and no other circulatory changes occur, then systemic blood pressure ________.
A. increases; decreases B. increases; increases C. decreases; decreases D. decreases; increases
Tom lightly touches Jane's back with two sharp pins but Jane only feels one sharp point. Why?
A. Tactile receptors on the back have small receptive fields. B. Jane is an insensitive person. C. Tactile receptors on the back have large receptive fields. D. The back has fine two-point discrimination. E. There is a high density of tactile nerve fibers on the back so she felt a sharp, discriminate pain.
Hassall's corpuscles are always found in the lighter-colored ________ regions of the thymus.
Fill in the blank(s) with the appropriate word(s).
How are signals most commonly transmitted across a synapse?
A. From soma to dendrite B. From axon terminal to dendrite C. From axon to axon D. From dendrite to axon