Do Now: Name the largest organ in your body Integumentary system Do Now: Name the largest organ in your body HW: Castle learning Quiz tomorrow

Important functions of the skin Protection: Keeps germs from entering the body, keeps body from drying out and protects against UV rays. Body Temperature Regulation: Skin releases heat produced by body cells and hair keeps heat in. Excretion: Sweat glands release waste Information Gathering: Sends information to the nervous system Vitamin D production: Needs sunlight to make this for the body

Integumentary System (Skin) Skin is the body’s largest organ The outer layer of the skin, Epidermis, is composed of layers of thin Epithelial cells (Dead) Keratin- A protein in epidermal cells which makes it leathery and waterproof( IN HAIR AND NAILS) A color pigment in skin called Melanin, is what absorbed Ultra Violet light to protect us The inner layer of living skin, Dermis, and has specialized structures such as Sensory Neurons, Blood Vessels, Muscle Fibers, Hair Follicles, and Glands

Cont.. Hair, which protects and insulates the body is produced in the dermis in pits called Hair Follicles Exocrine glands- Glands that release secretion through ducts in the skin Glands that release excess water, salt and Urea are called Sweat Glands Oil Glands, Which are found in large numbers on the face and scalp produce a fatty substance known as Sebum v

SKIN PROBLEMS Acne: Excess amount of Sebum, dead cells and bacteria produces the skin disorder Hives: Due to an allergic reaction. Fluid causes swelling. Skin Cancer: Due to sin and tanning damage. Sunscreen can be used for protection.