Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
Related questions
Question
What do you mean by erection and ejaculation?
Expert Solution
Step 1 Introduction:
The penis is the male sexual organ. The shaft is the longest part of it. The head or glans is at the end of the shaft. The opening at the tip of the head, where urine and semen come out, is called the meatus.
Step 2 Concept:
Erection:
An erection starts in the brain. Something seen, felt, smelled, heard, or thought makes your nerves send chemical messages to the blood vessels in your penis. The arteries relax and open up to let more blood flow in at the same time, the veins close up.
Once blood is in the penis, pressure traps it within the corpora cavernosa. Your penis expands and holds the erection. When the inflow of blood stops and the veins open, your penis becomes soft.
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