CHP6 The Intugumentary System

Hand by flexion lines form in wrist elbow areas skin

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Unformatted text preview: uller, & last for life port Freckles & moles= aggregations of melanocytes Friction ridges= markings that leave oily fingerprints • Allow primates to manipulate objects; unique pattern formed Allow during fetal development during Flexion (palmar) creases= llines of palm, form after birth ines by repeated closing of the hand by Flexion lines= form in wrist & elbow areas Skin Functions Skin Multiple functions of skin= 1) serves as a barrier; 2) Vit-D 1) synthesis; 3) sensory functions; 4) thermoregulation; & 5) social functions 5) Barrier= tough, dry skin unfavorable for bacterial growth; tough, oils contain bactericidal substances; sweat forms a film (acid mantle) unfavorable to microbial growth • • • Water (preventing in & out) & UV barrier 1-2% O2 diffuses thru skin; some CO2 & volatiles diffuse out Tares in skin or vectors allow for infectious agents to enter Vitamin D synthesis= begins in epidermal keratinocytes begins under influence of UV light under • Regulates bld Ca2+ & phosphate levels; helps maintain health of skeleton of Skin Functions (cont.) Skin Sensory functions= receptors for heat, cold, touch, receptors pressure, vibration & pain pressure, Thermoregulation= thermoreceptors and sweat glands • Input sent to hypothalamus which then tells cutaneous Input arteries to constrict (if cold) or dilate (hot) & sweat glands to produce sweat (hot)...
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