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Download 2015 SKIN2
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What do you know about the human body? SKIN Integumentary System Parts • Skin • Follicles • Oil Glands and Sweat Glands • Hair • Nails SKIN • largest organ in the body • 12-15% of body weight • surface area of 1-2 meters • Melanin – pigment or color cells that gives color to skin and protects from sun Layers of the Skin • Epidermis – outermost, thinnest layer (what we see). Outermost cells of the epidermis are dead • Dermis – layer right below the epidermis that contains blood vessels, sweat glands, oil glands, hair follicles, nerves, and muscles • Fatty Layer – insulates the body (also called Subcutaneous layer) FIVE Functions of Skin 1. Protection – protective covering 2. Sensory Response 3. Formation of Vitamin D – helps absorb calcium 4. Regulates body temperature 5. Rids your body of waste (sweat – water and salt) • Skin functions in homeostasis (maintaining body balance) • Protection (barrier) - selectively permeable – acts similar to cell membrane • Regulation of body temperature - sweat glands (perspiration) • Sensory reception – pain, pressure (touch) and temperature • Prevents excess water loss
