Anatomy & Physiology: The Unity of Form and Function, 7th Edition

Published by McGraw-Hill Education
ISBN 10: 0073403717
ISBN 13: 978-0-07340-371-7

Chapter 7 - Section 7.5 - Bone Disorders - Before You Go On - Page 223: 20

Answer

Callus is hardened layers of skin that develop when your skin tries to protect itself against friction and pressure. Layers are also made when fracture repair takes place to harden the bone and prevent future fracture.

Work Step by Step

The Healing of Fractures pg 221
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