Page 8 - Nerve activates contraction

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The penis is composed of three layers of spongy

erectile tissue.

 During sexual arousal the erectile tissue fills with

blood from arteries.

 The resultant increased pressure seals off the

veins that drain the penis.

 The engorgement of the penis with blood causes

an erection.

 An erection is essential for the insertion of the

penis into the vagina.

 The penis of some mammals possesses a

baculum, a bone that helps stiffen the penis.

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