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27 Cards in this Set
- Front
- Back
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Epidermis
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superficial layer of the skin
epithelial tissue top layer no blood vessels |
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epidermis- keratinocytes
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produce keratin
protects skin and tissue from heat,microbes, and chemicals |
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epidermis- melanocytes
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produce the pigment melanin
absorbs uv light |
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epidermis- langerhan cells
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derived from bone marrow
immune response |
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epidermis- Merkel cells
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sensory structure
sensation of touch |
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epidermis layer- stratum basale
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deepest layer
cells divide mitosis forms new cells |
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epidermis layer- stratum spinosum
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spiny cells
provide strength and flexibility to skin |
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epidermis layer- stratum granulosum
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Transition between active/dead cells
contains lamellar granules(release lipid that repels water) & keratohylin that turns tonofilament into keratin |
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epidermis layer- stratum lucidum
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present only- finger tips, palms, soles
dead cells keratin |
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epidermis layer- stratum corneum
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superficial layer
dead cells always being replaced barrier to light/water/heat |
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Dermis
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deeper layer of the skin
blood vessels connective tissue |
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Dermis-papillary region
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aerolar connective tissue
superficial layer touch sensations |
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Dermis-reticular region
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dense irregular connective tissue
deep layer elasticity epidermal ridges |
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Skin color pigments
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melanin
carotene hemoglobin |
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Thin Skin
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Covers most of the body
lacks epidermail ridges hairy less sensory receptors |
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Thick Skin
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cover palms, digits, and soles
no hair thick epidermal ridges |
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Wound healing- Epidermal
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minor injury
Basal cells migrate around wound epidermal cells meet (inibition) cells replace and skin is normal |
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Wound healing- Deep
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injury extends into dermis
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Wound healing- Deep- inflammatory
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blood clot unites with wound edges
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Wound healing- Deep- migratory
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regrowth of epithelial tissue
formation of scar tissue (fibroblasts) |
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Wound healing- Deep-proliferative
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migratory phase intensify
completion of tissue formation |
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Wound healing- Deep- maturation
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Scab falls off
normal agaiin |
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metphyses
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area between epiphysis and diaphysis
holds epiphyseal plate |
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PTH
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raises blood calcium levels by increasing bone resorption
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CT
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`decreases blood calcium levels by accelerating calcium depostion in bones and inhibitating osteoclasts
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calcitriol
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active form of vitamin D
raises blood calcium levels by increasing absorption of calcium |
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insulinlike growth factors
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during childhood it promotes growth at epiphyseal plate
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