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What is an erection?

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An erection is a sign of sexual arousal. It starts in your brain with something you see, feel, smell, or think. Your nerves send chemical messages to the blood vessels in your penis. The arteries relax and open up to let more blood to flow in. At the same time, the veins close up. Once blood is in the penis, pressure traps it inside. Your penis expands and holds the erection.

SOURCES:

National Institute of Diabetes and Digestive and Kidney Diseases.

Cleveland Clinic.

Reviewed by Melinda Ratini on November 15, 2017

SOURCES:

National Institute of Diabetes and Digestive and Kidney Diseases.

Cleveland Clinic.

Reviewed by Melinda Ratini on November 15, 2017

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What is ejaculation?

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