Antagonists are compounds that
A) Prevent synthesis of new receptors.
B) Prevent synthesis of hormones.
C) Bind to a receptor, activating it.
D) Bind to a receptor, but do not activate it.
Answer: D
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A/an ________is an environmental agent that causes changes in DNA structure.
Fill in the blank(s) with the appropriate word(s).
Compared to males who train for endurance events, females who train for such events typically
A. develop a higher percentage of muscle tissue because of testosterone. B. maintain a higher percentage of body fat. C. develop a higher percentage of muscle tissue because of estrogen. D. maintain a lower percentage of body fat.
Taste
a. discrimination depends on the ratio of stimulation of the taste buds, which have a variation in relative sensitivity. b. buds are stimulated only by chemicals in solution. c. discrimination does not go beyond distinguishing between the five primary tastes. d. both (a) and (b) above. e. all of these answers.
Blood flow to the ________ remains quite stable even when mean arterial pressure (MAP) fluctuates from 60 to 140 mm Hg.
A. kidneys B. stomach C. skeletal muscles D. hypothalamus E. adrenal gland