the integumentary system
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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The Integumentary System Chapter 6
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Hair• Functions
o protection (vestigial)
o sexual attraction
o insulation (head loses most of heat)
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Hair• Location-
o all external skin surfaces except palmar, plantar and labial (lips)
o females have quiescent hairs - "sleeping" waiting for hormones
o AKA lanugo (babies) and vellus hair in women
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Hair• Structure of a hair
o shaft is the visible part-dead part of hair
o root + epithelial cells + connective tissue = follicle
o hairs are alive if attached
o no new follicles after birth (sorry!!!)
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Hair• Hair Growth
o 1 cm per montho There are phases
of growth that are not predictable or under our control
o Zn2+ may influence hair growth or lack of growth also selenium will help (Se)
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Hair• Arrector pili
muscleo smallest muscles
in body (most numerous)
o one per hairo responds to cold
or fear (tickle)
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Sweat Glands
• Sebaceouso produce oil (body oil)o attached to hair follicleo most numerous in scalp
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Sweat Glands• Sebaceous
o sebum is the combination of dead cells and oil
o holocrine type of glando cells break down to
become the secretion of the gland
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Sweat Glands• Sebaceous gland functions
o lubricate skino stop water losso antibacterial action
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Sweat Glands
• Sebaceous gland pathologyo plugs of sebum can block
the duct (opening)o blackheads are made up of
sebumo pimples - infected oil glands
or hair canals (pus)
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Sweat Glands
• Sudoriferous glands • AKA eccrine glands
( eccrine = water)o regulate body temperatureo They make sweat!!!!o small excretory function -
circumstantial evolutionary evidence (frogs)
o aid in establishing a firm grippowder is used to counteract sweat!
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Sweat Glands
• Sudoriferous glandso salt is lost through sweating
(must be replaced)o 1 liter per day (usually
unnoticed in daily activities)o since evaporation gives the
body the cooling action, humidity can lessen the effect of perspiring
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Sweat Glands• Eccrine sweat
glandso Sweat exits the
skin through pores
o (seen as tiny white spots in this image)
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Sweat Glands
• Apocrine sweat glandso location
axial-armpits genital-groin
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Sweat Glands
• Apocrine sweat glandso Function
produce pheromones chemical messenger sexual attraction similar to musk oil