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Regulation of heat exchange in the skin.
Synthesis of the active hormone formed from vitamin D or its precursor in skin.
Relaxed ear position of a bored or resting horse. Lower lip is loose, also indicating relaxation. Th
Intradermal drug administration: (a) cross section of skin showing depth of needle insertion Source:
Primary aging means changes in hair color and skin texture for almost everyone.
An older woman with wrinkled skin, gray hair, and darker teeth, smokes a cigarette.