BIOL 131 Study Guide - Midterm Guide: Stratum Spinosum, Loose Connective Tissue, Stratum Basale
5 May 2020
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Document Summary
Epidermis is made up of epithelial tissue, used for a protective barrier. The epidermis is avascular, meaning there are no capillaries present; acquires nutrients from the dermis across the basement membrane. Dermis is dense connective tissue that is involved in structural support and sensory function. Hypodermis is loose connective tissue that is fatty, helpful for shock absorption. Keratinocytes: 90% of epidermal cells, structural support and protection from the outside world. Hard, rigid cells that use keratin to harden them. Melanocytes: spider-shaped cells that contribute to skin colour through the pigment, melanin (think melanism). Dendritic cells: part of the immune system, recognize foreign invaders and activates the immune response in that area. Tactile cells: sensory receptors involved with the sensation of touch and nerve endings in the skin. Thick skin is found in high traffic area of the body, like the hands, feet and fingers (5 layers)
