The Integumentary System Chapter 6
The Integumentary System
Feb 24, 2016
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 Presentation
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The Integumentary System Chapter 6
Hair• Functions
o protection (vestigial)
o sexual attraction
o insulation (head loses most of heat)
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
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!!!)
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)
Hair• Arrector pili
muscleo smallest muscles
in body (most numerous)
o one per hairo responds to cold
or fear (tickle)
Sweat Glands
• Sebaceouso produce oil (body oil)o attached to hair follicleo most numerous in scalp
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
Sweat Glands• Sebaceous gland functions
o lubricate skino stop water losso antibacterial action
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)
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!
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
Sweat Glands• Eccrine sweat
glandso Sweat exits the
skin through pores
o (seen as tiny white spots in this image)
Sweat Glands
• Apocrine sweat glandso location
axial-armpits genital-groin
Sweat Glands
• Apocrine sweat glandso Function
produce pheromones chemical messenger sexual attraction similar to musk oil
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