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Published byLionel McDowell Modified over 9 years ago
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The Integumentary System Section 32.3
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Functions Protection Temperature Regulation Excretion Information Gathering Vitamin D Production
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Structure: Skin Epidermis – Outer layer of skin – Two layers Top layer=dead cells Inner layer=living cells & stem cells. – Melanocytes Dermis – Contains collagen blood vessels nerve endings sensory receptors hair follicles smooth muscle sweat/sebaceous glands
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Structure: Hair Made of keratin Protects against UV rays, cold temps, and dirt/pathogens from entering nose/eyes/ears. Produced in hair follicles
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Structure: Nails Made of keratin Grow from nail root – Cells divide and are filled with keratin This produces a tough, plate-like nail Grow at 3mm per month
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Skin Problems Acne – When sebum/dead cells plug hair follicles – Bacteria trapped in plug – 85% people experience
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Skin Problems Hives – Red welts, signify an allergic reaction – Histamines released, cause swelling, blood vessel widening. – Fluid oozes into surrounding tissues.
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Skin Problems Cancer – Excessive exposure to UV radiation. – 60,000 people in USA get it each year, 8000 die. – Protect yourself from both UV-A and UV-B rays!
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Skin Cancer Basal cell carcinoma Squamous cell carcinoma Melanoma
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