EHS 160 Lecture Notes - Lecture 5: Dense Irregular Connective Tissue, Arrector Pili Muscle, Lamellar Corpuscle
11 Jun 2017
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Document Summary
Sweat glands located on tip of elevations reticular layer. Skin color determined by melanocytes depends on rate of melanin production low production allows reddish tinge b/c of underlying blood yellowish color - build up carotene in fat cells in hypodermis. Hair hair follicles are organs hair functions as sensory organ any hair movement stimulates nerve plexus wrapped around hair root hair on head acts to absorb shock. Eye lids - keep dust out of eyes dead keratinocytes filled with hard keratin. Don"t flake off shape of opening of hair follicle determines hair texture kinky hair- straight curly hair straight hair. Medulla - made up of loose cells cortex- tightly adhering cells of hard keratin cuticle - plates of cells with hard keratin. When contracts, hair becomes erect flesh around pore rises to form goosebumps hair growth. Head hair grows 5 to 7 years, follicle stops growing rapidly and hair falls out. Made up of hard keratin keratinocytes produce hard keratin.
