Convergence occurs when several presynaptic cells
A) depolarize simultaneously.
B) depolarize sequentially.
C) form a synapse with a single postsynaptic cell.
D) activate the sodium-potassium pump of a Schwann cell.
E) form a synapse with multiple postsynaptic cells.
C
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The scientist who received the first Nobel Prize in Medicine for his work on antibody therapy was
A. Koch. B. von Behring. C. Jenner. D. Roux.
Which of the following pairs is incorrectly matched?
A. macrophage; class II MHC protein B. B cell; class I MHC protein C. B cell; IL-2 secretion D. helper T cell; CD4 E. cytotoxic T cell; class I MHC protein
Blood flow distribution can be adjusted by
adjusting the diameter of the
a. arteries. b. capillaries. c. arterioles. d. veins. e. venules.
A population of rabbits introduced into an island grew rapidly for a few years and then the growth slowed down and stabilized. Why did the population become stable?
A) The carrying capacity was reached. B) Environmental resistance declined. C) A bust cycle was about to begin. D) The rate of immigration declined. E) The value of r decreased.