Male Sexual Response

Male Sexual Response - plateau phase. Orgasm is a short but...

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Male Sexual Response The sexual response of males is similar to the female sexual response. The penis is supplied by the dorsal artery, which supplies the penis with blood when flaccid. The deep arteries dilate in response to stimulation, which cause the lacunae of the corpora cavernosa to fill with blood. The production and secretion of nitric oxide and acetylcholine by the parasympathetic nerve causes dilation of the blood vessels by activating the enzyme that makes the second messenger cGMP. Viagra blocks the degradation of cGMP and therefore increases the duration of an erection. During excitement, the bulbourethral gland secretes preejaculatory fluid to remove residual urine from the urethra and provide lubrication for sexual intercourse. Erection is maintained during the
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Unformatted text preview: plateau phase. Orgasm is a short but intense reaction that usually lasts for 3 - 15 seconds. It is usually accompanied by ejaculation . In the male, ejaculation is actually two independent events -- emission and expulsion . Emission During emission, the sympathetic nervous system stimulates muscular contraction that propel sperm through the duct system. Peristaltic contractions of the ductus deferens moves sperm from the tail of the epididymis into the ampulla. Contractions of the ampulla propel the sperm into the prostatic urethra. The prostate gland contracts and adds prostatic secretions to the semen; secretions of the seminal vesicle join the semen soon after. These events often result in the sensation that ejaculation is imminent....
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