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from Human Anatomy Lab Manual by Elaine Marieb, 5th edition.

Sebaceous (oil) glands

found nearly all over the skin, except the palms of the hands and the soles of the feet. Their ducts usually empty into a hair follicle but some open directly into the skin surface. Sebum(mixture of oily substances and fragmented cells that acts as lubricant to keep skin soft and moist and keep the hairs from becoming brittle) is their product. Provide lubrication and antibacterial protection -------------------------------------------------------------------------------- Blackheads are accumulations of dried sebum, bacteria, and melanin from epithelial cells in the oil duct. Acne is an active infection of the sebaceous glands.

Sweat (sudoriferous) glands)

these exocrine glands are distributed all over the skin. Outlets for the glands are pores. They are carategorized by their secretions.

Merocrine sweat glands (eccrine)

produce clear perspiration consisting of water + salts (mostly NaCl), and urea. Under the control of the nervous system are an important part of the body's heat regulating apparatus. Especially prevalent on palms, soles and forehead. Provide some antibacterial protection.

Apocrine sweat glands

axillary and genital areas, they secrete a milky protein and fatrich substance that is an excellent nutrient medium for the microorganisms found on the skin. These glands enlarge and recede with the phases of a women's menstrual cycle, the apocrine glands may be analogous to the pheromone-producing scent glands of other animals. Their secretion is influenced by hormones; may act in signaling/communication

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