BIOL 1005 Lecture Notes - Lecture 1: Starch, Pectin, Osteoclast
20 Jul 2016
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Organ systems: human skin, 9-10 pounds / 15-20 sq. feet, heaviest organ of body, can shrink, stretch, swell, composed of. Collagen elasticity: sweat glands- 2. 5 million e. i. Temp regulation, cooling, nervous sweats skin to expand: epithelium- tissue (external, functions of skin, primary line of defense a. i. Barrier against bacteria, virus, fungi: retain water and moisture b. i. Most evident in burns: sweat glands c. i. Replace with potassium and sodium: radiator d. i. Capillaries dilate = excess heat: sensory e. i. Melanin: gives us color in skin and hair f. ii. Protects the skin from uv light: vitamin d g. i. Sunshine vitamin uv light melanin: renewal h. i. Shedding skin & adding new skin to it h. ii. Important for healing scars and skins need to close back up i. Oil glands- associated with hair follicles: hair and nails j. i. Epidermis: 1/20-inch-thick size of paper top layer j. ii. Epidermis: outer most layer consisting of layer of cells stacked in a tile like fashion.
