During the male sexual act,the penis becomes erect when blood fills the corpora cavernosa because of

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Erection is the first stage of the male sexual act and is achieved through either physical or psychogenic stimulation of sensory nerves in the genital area.Parasympathetic impulses from the sacral portion of the spinal cord cause a vascular effect.The arterioles dilate and blood fills the corpora cavernosa,causing the penis to expand and become rigid.The veins are compressed to occlude venous outflow.The nerve impulses are parasympathetic,not sympathetic.Prostaglandins are produced by the seminal vesicles for the lubrication stage; testosterone is involved in the production of sperm and is responsible for male sexual feelings and performance as well as muscle development.The flow of semen is the third stage of the male sexual act followed closely by the fourth and last stage,ejaculation.

During the Male Sexual Act,the Penis Becomes Erect When Blood