The normal level at which a physiological variable is maintained is known as its
A. control center.
B. set point.
C. effector.
D. negative feedback.
E. stimulus.
Answer: B
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Which of the following does not occur in a photoreceptor during exposure to light?
a. membrane hyperpolarization. b. closure of Na+ channels in the outer segment. c. increased transmitter release from the synaptic terminal. d. absorption of light by photopigments e. closure of Ca2+ channels in the synaptic terminal.
Enlargement of the prostate gland, or ________, typically occurs spontaneously in men over age 50
A) fibrocystic disease B) prostate cancer C) testicular cancer D) carcinoma E) benign prostatic hypertrophy
The figure shows the bones of the right orbit. What bone does "B" represent?
A. frontal B. maxilla C. zygomatic D. lacrimal E. ethmoid
In systemic inflammation, pyrogens ________.
A. decrease phagocytosis B. stimulate fever production C. decrease vasodilation D. are chemotactic factors E. increase neutrophil production