1. Anatomy & Physiology Integumentary System

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

3. Layers of the Skin 1.Epidermis – outermost layer 2.Dermis – Contains blood vessels, nerves, glands, & hair follicles – Covered with papillae (forms ridges & lines) 3.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)