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name an accessory structure
- hair
- sweat glands
- sebaceous glands
- nails
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where is hair produced
produced in hair follicles-extend into dermis and hypodermis
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what function does hair have
- protect scalp from UV,
- cushion light impacts,
- insulates the skull
- keeps foreign particles out
- keeps sweat from eyes
- also sensory receptors
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what does the hairs in the ears do
they detect sound and changes in balance
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how many has hairs has the body
2.5 million
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what does sweat glands do
- they produce sweat
- cools surface of skin to reduce body temp
- excretion of water and electrolytes
- protection from environmental hazards
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what does sebaceous glands do
- secrete oil product called sebum into hair follicle
- lubricates the skin and hair and makes skin water resistant
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what is sweat
sweat is 99% water and NaCl, organic nutrients and a peptide with antibiotic properties- dermicidin
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what does sweat do
- sweat dilutes harmful chemicals in contact with the skin
- washes bacteria from skin or makes it hard for them to stick
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what are nails
they are keratinised epidermal cells that protect dorsal surfaces of fingers/toes
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what are the functions of nails
- they limit distortion of the digits from mechanical forces
- enhances sensitivity of fingertip
- function as a tool-extended precision grip
- fingernails can provide clues to overall health
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what does nail clubbing suggest
- low O2-
- lung disease,
- IBS,
- CV disease
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what does spoon nails suggest
iron deficiency anaemia
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what does beaus lines suggest on nails
- uncontrolled diabetes
- zinc deficiency
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