The second heart sound is produced by the
a. opening of the AV valves.
b. closing of the AV valves.
c. opening of the semilunar valves.
d. closing of the semilunar valves.
e. blood rushing through the AV valves during diastole, creating a turbulent flow.
D
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Why does botox diminish frown lines?
A. It blocks acetylcholine receptors. B. It blocks sodium channels in motor neurons. C. It blocks the release of acetylcholine from motor neurons. D. It blocks the release of calcium from the sarcoplasmic reticulum. E. It blocks the binding site for myosin heads.
Choose the statement that correctly describes the structure or function of dendrites.
What will be an ideal response?
Bacteria-destroying stellate macrophages are found in the sinusoids of which of the following?
A. The liver B. The gastric glands C. The pancreas D. The intestinal crypts E. The appendix
The superior olivary nucleus
A. generates the endocochlear potential. B. receives impulses from the vestibular nerve. C. helps localize high-pitched tones near the apex of the basilar membrane. D. sends efferent impulses that inhibit all hair cells not vibrating maximally. E. stimulates additional hair cells.