Which of the following correctly describes an erection? Multiple Choice Parasympathetic impulses constrict arteries leading to the penis. The spongy tissue in the penis fills with air. Parasympathetic neurons release nitric oxide causing dilation of small arteries in the penis. Smooth muscles of vascular spaces in the penis contract.
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An erection occurs when there is increased blood flow to the penis, leading to its enlargement and rigidity. Show more…
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Adi S.
Sexual stimulation initiates impulses, leading to of arterioles and of venules supplying the erectile tissue. These vascular changes produce an , which permits placing the urethral opening near the opening of the cervix. Just before ejaculation, impulses stimulate contractions of the epididymis, , and ejaculatory ducts, leading from each testicle, and contractions in the accessory glands. Continued sexual stimulation of the glans leads to an , which is characterized by of semen with rhythmic contractions of located at the base of the penis. Immediately after ejaculation, impulses cause of arterioles and of venules supplying the erectile tissue, and the penis becomes flaccid. While the the two nervous systems generally act in opposite ways,
Madhur L.
A male has an erection when_____. a. muscles running the length of the penis contract b. germ cells release a surge of testosterone c. the posterior pituitary releases oxytocin d. spongy tissue inside the penis fills with blood
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