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Human Body Systems Unit

The skin, the largest organ of the body, comprises three layers: the epidermis, dermis, and fatty layer (subcutaneous). The outermost epidermis is thin, contains dead cells, and is responsible for color due to melanin. Below this, the dermis houses blood vessels, nerves, and glands, while the underlying fatty layer provides insulation. Skin performs vital functions such as protection, sensation, vitamin D formation, and temperature regulation. It also has mechanisms for healing injuries, including the formation of scabs and skin grafts.

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Human Body Systems Unit

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  1. Human Body Systems Unit The Skin

  2. Three Layers of Tissue • The skin is made up of three layers of tissues. • Epidermis, dermis, fatty layer (subcutaneous)

  3. Epidermis • Epidermis – outer, thinnest layer. a. The outermost cells are dead and water repellent. • New cells are produced at the base and move up to replace ones rubbed off.

  4. Epidermis c. Melanin – a pigment that protects your skin and gives it color (located in the epidermis). When skin is exposed to UV rays, melanin production increases and your skin becomes darker.

  5. Vitiligo • When melanocytes die, or do not function properly.

  6. Vitiligo Video

  7. Epidermis • Your skin is the largest organ of your body. It is also your largest sensory organ. STOP, PAUSE…. Take a DEEP BREATH You just breathed in dead skin cells from your neighbor! Dead dermis cells make up a large portion of ‘dust’.

  8. Dermis • Dermis – Located directly below the epidermis. • Contains blood vessels, nerves, muscle, oil, sweat glands, and other structures.

  9. Fatty Layer 3. Fatty Layer – insulates body  Think babies and sumo wrestlers….

  10. More Fatty Layers… Fatty layers are key in terms of animal hibernation…

  11. Types of Burns 1st Degree 2nd Degree 3rd Degree

  12. 2nd Degree 3rd Degree 1st Degree

  13. Types of Burns 1st Degree 2nd Degree 3rd Degree

  14. Major Functions • Your skin carries out several major functions. • Protection

  15. Major Functions 2. Sensory organs 3. Formation of Vitamin D • Produced in presence of UV light. • Essential for good health. • Helps body absorb calcium into blood.

  16. Major Functions • Regulation of body temperature • Ridding the body of wastes

  17. Injuries and Repair • Bruises • Tiny blood vessels below the skin burst. • Color goes away after pigments breakdown and reenter the blood stream.

  18. Injuries and Repair 2. Cuts • Any tear in the skin. • Blood flows until a clot forms and then a scab forms. • Skin cells divide and grow under scab until healed. WARNING: Behind this box Is a really gross picture.

  19. Injuries and Repair 3. Skin Grafts • Pieces of skin are cut from one part of a person’s body and moved to the injured or burned area where there is no skin. • Must be from own body or identical twin. SKIN GRAFT

  20. REINFORCEMENT SKIN VIDEO

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