PLN 103 Lecture Notes - Lecture 2: Melanocyte-Stimulating Hormone, Stratum Basale, Subcutaneous Tissue
13 Dec 2016
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Document Summary
80% of cells are made of these. Sensory receptor (for pain, temperature and touch) Go through the epidermis to the skin surface (hair, nails, multicellular exocrine glands) Arteries and veins are a part of this system and are in the hypodermis and up through the dermis. Protection of underlying tissues and organs against impact, abrasion, fluid loss, and chemical attack. Excretion of salts, water and organic wastes by integumentary glands. Maintenance of normal body temperature through either insulation or evaporative cooling, as needed. Production of melanin which protects underlying tissue from ultraviolet radiation. Production of keratin which protects against abrasion and serves as a water repellent. Synthesis of vitamin d3 for absorption of calcium. Storage of lipids in the dermis and hypodermis. Detection of touch, pressure, pain, and temperature to the nervous system. Epidermis: provides physical protection and helps keep microorganisms out, nutrients and oxygen diffuse from capillaries to dermis, only layer you can see.
