A circular structure behind the pupil that refracts light rays is the ____
A) iris
B) lens
C) cataract
D) ciliary body
B
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Which of the following does NOT increase the risk of male infertility?
A) Smoking B) Zinc deficiency C) Bicycling D) Age 40+
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In contrast to the sympathetic nervous system, the parasympathetic nervous system:
A. prepares the body to handle stress. B. causes an increase in the heart rate. C. slows the heart and respiratory rates. D. dilates the blood vessels in the muscles.
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