When a second EPSP arrives at a single synapse before the effects of the first have disappeared, what occurs?
A) spatial summation
B) inhibition of the impulse
C) hyperpolarization
D) temporal summation
E) decrease in speed of impulse transmission
D) temporal summation
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The structures that contain chemoreceptors that detect blood levels of oxygen and carbon dioxide are the
A. aortic bodies. B. aortic sinuses. C. capillary buds. D. aortic branches.
The celiac plexus contains:
a. somatic motor nerves b. visceral motor nerves c. blood vessels d. all of the above
Incomplete tetanus
A. is the time during which the tissue cannot respond again. B. results in complete and incomplete tetanus. C. is the condition in which the muscle fiber only partially relaxes between contractions. D. is the condition in which stimuli occur so rapidly that there are no intervening relaxations. E. is the constant tension produced by muscles for long periods of time.
The region of the sarcomere containing the thick filaments is the
A) Z line. B) M line. C) H band. D) A band. E) I band.