Penile erection is caused by _________
A) ?movements of the penile bone.
B) ?contractions of powerful muscles on the underside of the penis.
C) ?increased blood flow to the cavernous and spongy bodies within the penis.
D) ?contractions in the lining of the endometrium.
C
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What is the most likely cause of a disorder if both monozygotic and dizygotic twins show a high concordance rate?
a. recessive genes b. dominant genes c. different environmental experiences d. shared environmental experiences
Obesity is probably caused by
A. one gene that results in your body not using nutrients properly. B. eating the same amount that thin people eat. C. a number of complex, interacting factors. D. the same factors in humans as in other mammals.
A study of projected obesity rates for selected industrialized nations predicted higher adult rates of obesity ________.
A. until 2030, after which rates are expected to decline B. until 2030, but only because the way obesity is measured is expected to change C. among countries in North America, but not among countries in Europe or Asia D. among all nations in the study, with rates in the United States higher than those of any other nation
__________ occurs when there is a significant passage of time between the behavior and presentation of the reinforcer
a. Delayed reinforcement b. Negative reinforcement c. Immediate reinforcement d. Primary reinforcement