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Across 2. variant of derma, or the layer of skin below the epidermis. 6. something that covers, coats, or encloses, example. a skin, membrane, coat, or other natural covering. 8. any of numerous tiny tubular glands located near the surface of the skin, that secrete sweat. 11. a fibrous protein in bone, cartilage, and other connective tissue. 12. a _____________ forms over a cut to stop bleeding and to keep bacteria from entering the wound. 13. the outer, nonsensitive layer of skin. 14. to defend or keep safe; shield from danger or harm 15. a small cavity or sac with a narrow mouth, such as that surrounding the root of each hair. 17. microscopic organisms that have one cell. 19. a hard growth at the end of a finger or toe.

Down 1. the maintenance of a constant internal state in a changing environment. 3. a dark pigment that colors the skin, hair, and other tissue of humans and some animals. 4. a thin, thread-like strand that grows from the skin of humans and other mammals. 5. attached to a hair follicle can contract and cause the hair to stand up. 7. a substance made by certain cells in the body. 9. a nail grows from a living cells in the _____________ at the base of the nail. 10. cells composed of fat. 16. a disease in which certain cells divide and grow much faster than they normally do. 18. a skin condition that makes pimples appear on the face, back, or chest. It happens when oil glands in the skin are blocked.