Interferons ________.
A. are produced by viruses
B. provide humoral immunity
C. provide nonspecific immunity
D. stimulate viral replication
Answer: C
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Vasoconstriction of the blood vessels to the skin
a. is coordinated by the sympathetic nervous system. b. lowers heat exchange with the environment. c. occurs when core body temperature is elevated. d. both (a) and (b) above e. all of these answers.
Most preganglionic fibers in the sympathetic nervous system synapse with ________
A) no neurons B) somatic neurons C) effectors directly D) 10-20 postganglionic neurons E) parasympathetic neurons
When compared to a primary response, the antibody levels in a secondary response
A. rise more rapidly and with a greater proportion of IgG antibodies. B. rise more rapidly and with a smaller proportion of IgG antibodies. C. rise more gradually and with a greater proportion of IgG antibodies. D. rise more gradually and with a smaller proportion of IgG antibodies.
The cells in capillaries in this organ exhibit fenestrations that promote exchange:
a. heart b. kidney c. liver d. skin e. brain