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Integumentary System

Integumentary System. Protecting you from the outside world. Parts of the system . Skin Layers- dermis, epidermis Hair follicles Nails Sweat Glands Sebaceous Glands *Some consider other membranes as well (ex- mucosal). We will only look at skin. Skin. 2 layers Epidermis Dermis

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Integumentary System

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  1. Integumentary System Protecting you from the outside world

  2. Parts of the system • Skin • Layers- dermis, epidermis • Hair follicles • Nails • Sweat Glands • Sebaceous Glands • *Some consider other membranes as well (ex- mucosal). We will only look at skin

  3. Skin • 2 layers • Epidermis • Dermis • Epidermis • Dead, keratinized skin, made of 5 layers of dead skin • Constantly shed • Holds melanocytes, make melanin, skin pigment • Dermis • Under epidermis • Made of blood vessels, connective tissue

  4. Within the skin • Hair follicles • Sweat Glands • Sebaceous Glands

  5. Hair Follicles • Cells within dermis divide by mitosis • As cells push up, keratinization occurs (like epidermis) • Type of keratin (genetically determined) results in hair’s shape (straight, curly, etc.) • Goosebumps • Small muscle pulls on hair, causing to stand on end • Evolutionary reaction to trap heat

  6. Sweat Glands • Small tubes beginning in dermal layer • Tube exits on epidermis • Excretion contains • Salt • Urea • Uric acid • Ammonia • Sugar • As water evaporates, removes heat from body

  7. Sebaceous Glands • Along sides of hair follicles • Create oily substance that rubs onto hair and skin • Increase production during puberty,  acne!

  8. Nails • Also keratinized • As keratin and air mix, white substance is left on nail nearest skin • Nail bed grows nails1mm per week

  9. Diseases • Eczema • Poison Ivy/Poison Oak/Poisonwood • Albinism • Athlete’s Foot • Treeman

  10. Eczema • Any inflammation of the epidermis • Result of infection, allergen, or irritant • Causes redness, swelling, itching

  11. Poison _________ • Plants that secrete chemicals that irritate the skin of MOST people • Includes poison ivy, poison oak, poisonwood, and cashews! • Once oils washed off, rash cannot be spread • You cannot spread by itching the rash unless the oil is still on you

  12. Poisonwood rash Cashew

  13. Albinism • Recessive genetic mutation results in body’s inability to produce melanin, a pigment • Causes very pale skin, hair, eye coloration • Same mutation exists in many mammals

  14. Albinism

  15. Athlete’s Foot • Fungal infection, primarily of feet, but can occur anywhere on body • Spread by contact • This is why you wear shower shoes in college!!!

  16. Athlete’s Foot

  17. Treeman • Rare double-genetic disorder resulting in body having difficulty regulating zinc levels • Causes large wart-like growths all over body

  18. Treeman

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