The integumentary system
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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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The integumentary system

The Integumentary System

Chapter 6


The integumentary system

Hair

Functions

protection (vestigial)

sexual attraction

insulation (head loses most of heat)


The integumentary system

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


The integumentary system

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!!!)


The integumentary system

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)


The integumentary system

Hair

Arrectorpili muscle

smallest muscles in body (most numerous)

one per hair

responds to cold or fear (tickle)


Sweat glands

Sweat Glands

Sebaceous

produce oil (body oil)

attached to hair follicle

most numerous in scalp


Sweat glands1

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


Sweat glands2

Sweat Glands

Sebaceous gland functions

lubricate skin

stop water loss

antibacterial action


Sweat glands3

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)


Sweat glands4

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!


Sweat glands5

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


Sweat glands6

Sweat Glands

Eccrine sweat glands

Sweat exits the skin through pores

(seen as tiny white spots in this image)


Sweat glands7

Sweat Glands

Apocrine sweat glands

location

axial-armpits

genital-groin


Sweat glands8

Sweat Glands

Apocrine sweat glands

Function

produce pheromones

chemical messenger

sexual attraction

similar to musk oil


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