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2 types of body membranes
epithelial & connective tissue membrane
epidermis sublayers
stratum corneum
stratum lucidum
stratum granulosum
stratum spinosum
stratum basale/germinativum
epidermis cell types
keratinocytes
melanocytes
langerhan cells
merkel cells
dermis divided into 2 layers
papillary & reticular layer
skin function
body temperature regulation
cutaneous sensation
metabolic function
blood reservoir
excretion
protection
3 parts of hair
shaft, root, follicle
3 concentric layers
medulla, cortex, cuticle
hair follicle has…
blood vessels, oil/sebceous glands, hair root plexuses, arrector pili
hair root plexuses
nerve endings that are sensitive to touch/ motion
arrector pili
a smooth muslce
if cold/ frightened, brain stimulates to contract & make your hair stand up → goosebumps