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STARTER #3 1. Label the cavities to the right a. b. c. d. 2. What type of tissue lines organs and cavities? 3. What type of tissue is this? INTEGUMENTARY SYSTEM PP 924-926 PARTS OF INTEGUMENTARY • Skin • Nails • Hair SKIN FUNCTION • Barrier against mechanical and chemical injury • Protection of microbial invasion • Prevention of dehydration • Regulation of body temperature • Sensory • Vitamin (D) synthesis SKIN LAYERS Epidermis- outermost layer of skin • Contain melanocytes • make melanin (gives pigment and protection from UV light) SKIN LAYERS Dermis-inner layer of skin • composed of blood vessels, nerves, hair follicles, glands SKIN LAYERS • Glands • Oil glands attached to hair follicles • Secrete sebum (oils) • Sweat glands regulate body temperature • Subcutaneous: fat cells (insulation) SKIN CANCER • Most common in the U.S. • Can affect skin cells or melanocytes (worst type) • People of light skin tone, blue eyes, and red hair are most at risk NAILS • • Protect ends of toes and fingers Made of keratin HAIR • Protect and insulates the body • Produced by hair follicles • Made of keratin
