Cytokines are
A) foreign bodies such as viruses and bacteria.
B) in the bone marrow and produce antibodies.
C) a type of leukocyte and are part of the immune system.
D) chemical messengers that allow immune cells to communicate with each other.
D
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The most widely used aversion therapy for smoking is
a. a nauseating drug called Antabuse. b. response-contingent shocks. c. rapid smoking. d. systematic desensitization.
The genetic characteristics of the ____ determine the baby's sexual identity
a. older siblings b. father's sperm c. mother's ovum d. parents' shared wishes
At approximately age ______, the genetic clock "switches off" growth genes
Fill in the blank with correct word
Stimulants are drugs that
A. increase relaxation and relieve pain and anxiety. B. lead to incapacitation and an inability to resist sexual assault. C. have an arousal effect on the central nervous system. D. slow down the nervous system.