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Anatomy & Physiology

Anatomy & Physiology. Integumentary System. Integumentary System. Largest system in the body Largest organ in the body System includes skin, glands, blood vessels, nerves, hair, & nails. Layers of the Skin. Epidermis – outermost layer Dermis

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Anatomy & Physiology

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  1. Anatomy & Physiology Integumentary System

  2. Integumentary System • Largest system in the body • Largest organ in the body • System includes skin, glands, blood vessels, nerves, hair, & nails

  3. Layers of the Skin • Epidermis – outermost layer • Dermis • Contains blood vessels, nerves, glands, & hair follicles • Covered with papillae (forms ridges & lines) • Hypodermis • Innermost layer; contains fatty tissue & connective tissue;

  4. Layers of the Skin

  5. Glands in the Skin • Sebaceous glands • Attached to hair follicles • Keeps skin & hair from becoming dry / brittle • If blocked with dirt/oil = pimple • Sweat glands • Coiled tubes extending through the dermis (not attached to hair follicles) • Sweat contains water, salts, sm amt of uric acid

  6. Glands in the Skin

  7. Additional Components • Nails • Protect fingers & toes • Made of dead epidermal epithelial cells (has a root) • Hair • Consists of root and hair shaft • Protects & covers body surface • Alopecia = permanent hair loss on the scalp

  8. Additional Components • Hair erector muscle • Muscle connected to each hair follicle • Contracts in response to cold, fear, etc. (“Goosebumps”) • Blood vessels • Carry blood & brings oxygen to cells

  9. Additional Components • Pacinian corpuscle • Nerve receptors; respond to pressure, pain, vibration, temp. • Located in the hypodermis • Melanocyte • Cell producing melanin (dark colored pigment that protects skin from UV rays)

  10. Melanocyte • Oil gland • Sweat gland • Pacinian corpuscle • Hair erector muscle • Hair follicle • Hair shaft • Blood vessel (artery & vein) • Layers (Epidermis, Dermis, Hypodermis)

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