BIO 446L Lecture 2: Unit 2 Notes
Document Summary
Is(cid:374)"t a(cid:272)tuall(cid:455) see(cid:374) as pa(cid:396)t of the ski(cid:374) (cid:449)hi(cid:272)h is (cid:449)h(cid:455) the de(cid:396)(cid:373)is a(cid:374)d epidermis are known as the two main regions of the skin: anchors skin to underlying structures, shock absorber and insulator. Our skin color is actually based off of how much melanin is produced and retained: freckles and moles are accumulations of melanin, carotene, yellow/orange pigment, only in plants. Increases intestinal reabsorption of ca2+ and po43: secretion and absorption (selectively permeable) Stratum basale: deepest, attached to basement membrane, epidermal ridges increase grip. Interdigit with epidermal ridges to increase area of contact and interlock the 2 layers: reticular layer, dense irregular connective tissue, mostly made up of collagen fibers that run parallel to the skin surface. Glands: sebaceous glands, secretes sebum, bactericidal (prevents growth of bacteria, stimulated by hormones, function as holocrine glands, usually secretes into hair follicles, the secretions soften and lubricate hair and skin.
