2. o Outer, thinnest layer. Outermost cells are dead and water repellent. o Are below epidermis thicker than epidermis and contain blood vessels. Nerves, muscles, oil. And sweat glands and other structures.

3. o Insulates the region this is where most of the fat is deposited, when a person gains weight. Also make body get warm.

4. Cells in the epiderms produce the chemical melanin, a pigment that give protection to the skin and gives its color.

5. o Sensory response o Regulation of body temperature o Ridding the body of the wastes o Secrete fluids that destroy bacteria o Slows water loss o Nerve cells detect and relay information to brain.

6. o Protection=physical, chemical injuries… bacteria, diseases o Formation of vitamin D= ultraviolet light, epidermis… v.D absorb calcium into blood from food in your digestive tract.

7. o Blood vessels in skin release or hold heat, if blood vessels dilate, blood flow increase, pores open to lead the sweat glands and heat is release, but when blood vessels constrict, less heat is going to be released. o Adult’s dermis has about 3 million sweat glands where the body tº is regulated and wastes are excrete.

8. o Sweat is produced by muscle contractions. o Heat transfers from the body to the sweat to the skin. o Sweat evaporates being released and cooling the skin.

9. o Wastes are produced when nutrients are broken down. o A lot of water and salt release, cause extreme heat o For regulation of the body temperature sweet gland release wastes

10. o When skin is damage epidermis produce new cells and dermis repair tears o When skin is injured, diseases caused by organisms can enter to the boy rapidly and an infection results

11. o Occurs when tiny blood vessels beneath the skin break. o Blood cells from the break vessels surround the tissue. o red blood cells release hemoglobin that then turns on pigments.

12. o The body repair small injuries but not the big ones. o When there’s not cells for big injuries pieces of skin are removed from another part of the body and then the blood vessels attach to the new piece of skin

14. Glencoe,science,levelgreen, mc graw hill