KNES 260 Lecture Notes - Lecture 12: Merocrine, Eponychium, Sweat Gland

• School: University of Calgary
• Department: Kinesiology
• Course: KNES 260
• Professor: Carol Anne Gibbons Kroeker

Document Summary

Functions: protection, excretion (waste products, temperature maintenance (regulates temp, nutrient storage, vitamin d3 synthesis, sensory detection. Keratin: brous structural protein, in nails, hair, skin, callus = build up of keratinal sites = extra thick epidermis, epithelial cells become corni ed with keratin, makes skin waterproof. Skin colour: depends on, blood supply, carotene and melanin, melanocytes produce melanin and protect from uv radiation, epidermal pigmentation. Epidermal cells: synthesize vitamin d3 when exposed to uv, respond to epidermal growth factor, growth, division, repair, secretion (persperation) & excretion (waste products, toxins) Papillary layer: most super cial, contains blood vessels, lymphatic vessels, sensory nerves of epidermis. Reticular layer: contains network of collagen and elastic bres to resist tension, provides further protection, doesn"t have vascular, lymphatic, and neural: cutaneous plexus of arterioles found in subcutaneous layer/papillary dermis, cutaneous sensory receptors (light, touch, pressure) Stretch marks: excessive stretching of the dermis (mainly reticular layer)