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protection, regulation of body temperature, excretion of wastes, healing wounds, D3 synthesis, and sense reception
stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, stratum germinativum (stratum basale)
the five layers of epidermis
thicker layer of connective tissue beneath the epidermis that contains blood vessels, nerves, etc.
subcutaneous layer of loose connective tissue beneath the dermis characterized by the presence of adipose tissue
dark brown pigment produced by cells called melanocytes. Screen out excessive ultraviolet rays, to protect nucleus and the genetic material of the cell.
1st degree burn
less than 10% of body surface affected, epidermis changed but not destroyed; mild swelling, reddening, pain; injured cells peel off and skin heals without scarring, usually w/in two weeks.
2nd degree burn
less than 15% of body surface for an adult, 10% for a child; epidermis andpart of dermis destroyed. New skin may regenerate; red or mottled appearance, blisters, swelling, wet surface due to plasma loss. Greater pain than third-degree burn (which destroys sensitive nerve endings)
3rd degree burn
includes burns of face, eyes, hands, feet, genitals, and more than 20% of body surface. Prompt medical attention required; all skin layers destroyed, deep tissue destruction. Nerve endings in skin destroyed. Skin cannot be regenerated. Surgery and skin grafts necessary; white or charred appearance, severe loss of body fluids
a localized elevation of the overlying epidermis which accumulates fluid in the papillary dermis; hives
a solid elevated area containing epidermal and papilary dermal components; mosquito or other insect bite
an ulcer may occur following the rupture of a vesicle or pustule. Eroded sites have lost part or all of the normal epidermis; decubitis ulcer
an accumulation of dried sebum, blood, or interstitial fluid over the surface of the epidermis; seborrheic dermatitis, scabs, impetigo
a split in the integument that extends through the epidermis and into the dermis; athlete's foot
a jagged, irregular tear in the surface produced by solid impact or by and irregular object
phagocytic white blood cells remove damaged tissue and harmful microorganisms
3rd step in healing a wound
cells in the dermis called fibroblasts produce collagenous fibers and form a scar
5th step in healing a wound
made up of bone, cartilage, tendons, and ligaments; provides protection, support, and movement for the body.
long bone, short bone, flat bone, irregular bone, sesamoid bone, sutural bone
major classification of bones
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