Defense of the body against a particular pathogen is provided by
A) nonspecific immunity.
B) specific immunity.
C) immunological surveillance.
D) skin defenses.
E) fever.
Answer: B
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What happens when the radial muscle of the eye contracts or shortens? a. The size of the pupil decreases. b. The size of the pupil increases
c. The lens becomes more concave. d. The lens becomes more convex. e. The iris reflects less light.
Which gland is unique in that it is large in the fetus and infant, but is a small remnant in the elderly?
a) adrenal gland b) pancreas c) thymus d) thyroid gland
Arnold enters a darkened movie theater on a sunny summer afternoon. It takes many
minutes for his eyes to adapt to the darkness because A) it takes some time for the retina to rebuild its rhodopsin stores from opsin and retinal. B) the rods in the eye work only in bright light, and it takes time for the cones to work in weak light. C) the optic nerve fatigues in bright light, and it takes time to recover. D) the iris takes time to close after being subjected to bright light.
In nonpregnant women, ________ inhibits secretion of substantial amounts of prolactin.
A. estrogen B. progesterone C. dopamine D. GnRH