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• Skin, hair, and nails act as barriers that protect the body from the environment.

• Skin is composed of two layers, which are the epidermis and the dermis.

• Hair and nails are composed of the protein keratin; they grow from a root of rapidly dividing cells.

• Sweat glands produce sweat, which cools the body. Oil glands secrete sebum, which softens the skin.

Vocabulary epidermis (p. 924) keratin (p. 924)

melanin (p. 924) dermis (p. 924)

exocrine gland (p. 925) sweat gland (p. 925)

oil gland (p. 925) sebum (p. 925)

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