Erection of the penis is caused by ________
A) dilation of the veins in the penis
B) a sympathetic reflex
C) engorgement of blood in the erectile tissues
D) None of the listed responses is correct.
C
Explanation:
A) Dilation of the veins in the penis does not cause penile erection.
B) Penile erection is not due to a sympathetic reflex.
D) One of the listed answers is correct.
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