Penile erection is related to changes in blood flow. How?
A. Engorgement of the penis with arterial blood compresses the veins in the penis
B. Erection is produced when venous blood outflow from the penis is increased
C. Increased sympathetic input to the penis leads to an erection
D. Increased blood flow to the penis causes the skeletal muscle to undergo prolonged contraction
E. Increased parasympathetic input leads to the release of nitric oxide and vasodilation
Answer:
A. Engorgement of the penis with arterial blood compresses the veins in the penis
E. Increased parasympathetic input leads to the release of nitric oxide and vasodilation
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