Section 36-3: Integumentary System (Skin)

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Presentation transcript:

Section 36-3: Integumentary System (Skin) * Includes skin, hair & nails * Skin = largest organ of human body

Functions of the Skin: 1. Regulate body temp. a. Blood vessels When hot, vessels dilate & release heat as blood flow increases

When cold, vessels constrict & heat is conserved b. Sweat – released by glands to cool body

2. Senses – sensory neurons detects hot/cold, pressure & environ. conditions 3. Vitamins – when exposed to UV light, makes vitamin D helps absorb calcium

4. Remove Wastes Sweat – releases excess water, salts & urea 5. Protection from… Physical & chemical damage Disease (1st line of defense)

3 Layers of Skin: Epidermis – outermost layer made of dead cells & constantly replaced a. Keratin – protein that… makes nails gives tough texture “waterproof” quality

b. Melanin – pigment that… colors the skin protects cells from sun damage more sun exposure makes more melanin

2. Dermis – inner, thicker portion of skin Contains: Nerves Blood vessels Hair follicles (warmth & protects) Sweat glands Oil glands – soften skin

3. Subcutaneous Layer (Hypodermis) Mostly fat deposits Absorb impact Retain heat Store food

How Cuts Heal 1) Blood clots & cut closes 2) New cells push damaged cells to surface 3) Scab forms & WBC fight wound infection 4) New cells fill in gap of scab

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