Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 41 - Self-Quiz - Page 741: 8



Work Step by Step

The dilation of the arteries in the penis, stimulated by the actions of sympathetic nerves, causes the spongy tissue of the penis to expand, which consequently constricts the veins. Because the blood flowing into the penis is greater than the blood going out, the internal fluid pressure increases, which causes the penis to get larger and stiffer in preparation for sexual intercourse.
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