How does steroid use influence male reproductive organs?
a) Testicles shrink, and sperm count lowers
b) Testicles enlarge, and sperm count increases.
c) Blood flow to the penis is reduced, causing erectile dysfunction.
d) Prostate gland shrinks, and levels of pheromones in sweat lower.
A
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The two different pathways in the brain involved in the detection of danger differ from one another with respect to
a. their roles in panic disorder versus specific phobia. b. the amount of conscious thinking and reasoning. c. the detection of reality-based versus unrealistic threats. d. their presence in humans versus lower animals.
Humans are most sensitive to frequencies in the range of 2,000 to 4,000 Hz, which corresponds to frequencies of _____
a. predators in the environment b. most human conversation c. environmental sounds such as rain and thunder d. sounds that are unlike those of other animals in the environment