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The Integumentary System

The Integumentary System . Chapter 6. Hair. Functions protection (vestigial) sexual attraction insulation (head loses most of heat). Hair. Location- all external skin surfaces except palmar , plantar and labial (lips) females have quiescent hairs - "sleeping" waiting for hormones

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The Integumentary System

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  1. The Integumentary System Chapter 6

  2. Hair Functions protection (vestigial) sexual attraction insulation (head loses most of heat)

  3. Hair Location- all external skin surfaces except palmar, plantar and labial (lips) females have quiescent hairs - "sleeping" waiting for hormones AKA lanugo (babies) and vellus hair in women

  4. Hair Structure of a hair shaft is the visible part-dead part of hair root + epithelial cells + connective tissue = follicle hairs are alive if attached no new follicles after birth (sorry!!!)

  5. Hair Hair Growth 1 cm per month There are phases of growth that are not predictable or under our control Zn2+ may influence hair growth or lack of growth also selenium will help (Se)

  6. Hair Arrectorpili muscle smallest muscles in body (most numerous) one per hair responds to cold or fear (tickle)

  7. Sweat Glands Sebaceous produce oil (body oil) attached to hair follicle most numerous in scalp

  8. Sweat Glands Sebaceous sebum is the combination of dead cells and oil holocrine type of gland cells break down to become the secretion of the gland

  9. Sweat Glands Sebaceous gland functions lubricate skin stop water loss antibacterial action

  10. Sweat Glands Sebaceous gland pathology plugs of sebum can block the duct (opening) blackheads are made up of sebum pimples - infected oil glands or hair canals (pus)

  11. Sweat Glands Sudoriferous glands AKAeccrine glands( eccrine = water) regulate body temperature They make sweat!!!! small excretory function - circumstantial evolutionary evidence (frogs) aid in establishing a firm grippowder is used to counteract sweat!

  12. Sweat Glands Sudoriferous glands salt is lost through sweating (must be replaced) 1 liter per day (usually unnoticed in daily activities) since evaporation gives the body the cooling action, humidity can lessen the effect of perspiring

  13. Sweat Glands Eccrine sweat glands Sweat exits the skin through pores (seen as tiny white spots in this image)

  14. Sweat Glands Apocrine sweat glands location axial-armpits genital-groin

  15. Sweat Glands Apocrine sweat glands Function produce pheromones chemical messenger sexual attraction similar to musk oil

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