Saladin: Anatomy & Physiology: The Unity of Form and Function, Third Edition
6. The Integumentary System
© The McGraw-Hill Companies, 2003
Hair, nails, and cutaneous glands are the accessory organs, or appendages, of the skin. Hair and nails are composed mostly of dead, keratinized cells. While the stratum corneum of the skin is made of pliable soft keratin, the hair and nails are composed mostly of hard keratin. Hard keratin is more compact than soft keratin and is toughened by a greater number of disulfide bridges between the protein molecules.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.