Notes

Chapter 6 Skin and Subcutaneous Tissue Skin- composed of epi corium (stratified squamous epithelium) and Dermis (deep connective tissue) Thick bark- covers palms, soles and surfaces of fingers and toes. Thin Skin- covers rest of the carcass. Functions of the beat Resistance to Trauma and Infection- come up feigns the most physical injuries to the remains; keratin- tough protein packed in epidermal cells. Other bar Functions- prevents body from losing/ absorbing excess water; blocks UV favorable Vitamin D Synthesis – skin carries; released by sun; vitamin D-bone preparation and maintenance Sensation- warmheartedness endings present for hot, cold, touch, texture, pressure, vibration and tissue injury. Ther muchgulation- thermo sense organs in the dermis send signals to the brain and back to dermis; cold- vasoconstriction; hot- vaso dilatation. accessible Functions- facial expressions; body language; scars; adolescence. Epidermis- Cells Stem Cells- undifferentiated cells that bear up under mitosis to form; Keratinocytes- majority of epidermal calls; synthesise keratin Melanocytes- degree elementarye; synthesize melanin (brown to black pigment) ; keratinocytes phagocytize melanin fragments.-- ex. Light skin melanin is not capacious and is clumped near keratinocyte nucleus. Tactile (Merkel) Cells- touch receptor in basal layer of epidermis and are associated with nerve fibers in the dermis Dendritic (Langerhans) Cells- found in spinosum and granulosum; macrophages in skin against toxins, microbes, and pathogens. Epidermis- Layers (look up order) point Basale- single layer of cubiform to low columned stem cells and keratinocytes resting on the basement membrane. Stratum Spinosum- several layers of keratinocytes; t! hickest; mitosis is limited- more keratin filaments; water retention. Stratum Granulosum-...If you want to get a full essay, order it on our website: BestEssayCheap.com

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