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Integumentary System - temperature regulation sensory...

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Integumentary System The skin is the largest organ in the body: 12-15% of body weight, with a surface area of 1-2 meters. Skin is continuous with, but structurally distinct from mucous membranes that line the mouth, anus , urethra , and vagina . Two distinct layers occur in the skin: the dermis and epidermis . The basic cell type of the epidermis is the keratinocyte , which contain keratin , a fibrous protein. Basal cells are the innermost layer of the epidermis. Melanocytes produce the pigment melanin , and are also in the inner layer of the epidermis. The dermis is a connective tissue layer under the epidermis, and contains nerve endings, sensory receptors, capillaries , and elastic fibers. The integumentary system has multiple roles in homeostasis, including protection,
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Unformatted text preview: temperature regulation, sensory reception, biochemical synthesis, and absorption. All body systems work in an interconnected manner to maintain the internal conditions essential to the function of the body. Hair and Nails Hair, scales, feathers, claws, horns, and nails are animal structures derived from skin. The hair shaft extends above the skin surface, the hair root extends from the surface to the base or hair bulb . Genetics controls several features of hair: baldness, color, texture. Nails consist of highly keratinized, modified epidermal cells. The nail arises from the nail bed, which is thickened to form a lunula (or little moon). Cells forming the nail bed are linked together to form the nail....
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