The amount of melatonin secreted by the pineal gland is regulated by
A. a person's individual metabolic rate.
B. the amount of sleep a person gets.
C. blood glucose levels.
D. the photoperiod (the daily amount of daylight).
E. the stress response.
Answer: D
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When the ventricles contract, the bicuspid (mitral) valve prevents blood from flowing from the:
A) right ventricle to the right atrium B) left ventricle to the left atrium C) left atrium to the right atrium D) right atrium to the left atrium E) left ventricle to the right ventricle
Vasoconstriction is caused by ______ stimulation of vascular smooth muscle; ______ stimulation of vascular smooth muscle causes vasodilation
A. decreased; increased B. parasympathetic; sympathetic C. sympathetic; increased D. parasympathetic; decreased E. sympathetic; parasympathetic
Depolarization of a postsynaptic neuron in response to a neurotransmitter is called an ___ postsynaptic potential.
Fill in the blank(s) with the appropriate word(s).
The skin on the posterior surface of the hand is supplied by the
A) median nerve. B) musculocutaneous nerve. C) ulnar nerve. D) axillary nerve. E) radial nerve.