Word: cavernosa
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...normal erection results from a complex interaction of forces. Mental or physical stimulation sets off a series of nervous reflexes that increase blood flow to the penis. As the blood fills the corpora cavernosa, two rod-shaped bundles of spongy tissue running the length of the organ, the penis expands, becoming hard and erect. But the sexual response is fragile; it can easily be disrupted by emotional or physical problems (some, like an excess of alcohol, temporary...