integumentary system Flashcards
function of hair
aids in trapping a layer of air above skin which provides insulation
function of hair follicles
secreates an oily substances which prevents the hair from being too dry
function of sweat gland
produces sweat
function of sweat pore
sweat is released from the sweat pore which cools the skin down as it evaperates
sweat duct functon
transports sweat from sweat glands to sweat pore
function of erector muscle
contracts and relxes to move hair
function of sebceous glands
produces an oily substances called sebum which waterproofs and lubricates skin
function of sensory nerve endings
stense stimuli from external environment such as pain / temp
function of subcutaneous fat
insulates body
function of capillaries
blood flows through capillarie
what are Mechanoreceptors
tell you about sensations of pushing, pulling or movement
what are Thermoreceptors
tell you about sensations of temperature
3 function of skin
Protects us from infection .
Keeps our body at the right temperature.
Covered in receptors so we can feel things.
purpose of skin
- Thermoregulation
- Protection against foreign bodies
- Protection against mechanical damage
- Protection against solar radiation
- Energy storage
- Production of Vitamin D
what does sebaceous glands produce
oils which also help to kill microbes
whats name of the fat
adipose
what causes skin cancer
Exposure to too much UVA and B can cause skin cancer.
what does UVA do
tans
what does UVB do
burns
what does Temperature receptors in the skin detect
changes in the external temperature
pass this information to hypothalamus
control of body temp name
Thermoregulation
body temp too cold
Hypothermia
body temp too hot
Hyperthermia
what happens to capillaries if too hot
vasodilation of surface capillaries - dilates - blood can pass quicker
vasodilation effect
increase sweating
decreases metabolcrate
hairs lie flat
what is vasodilation
too hot - dilate
what happens to capillaries if too cold
vasoconstriction
what is vasoconstriction
contraction
vasoconstriction effect
dilate
decreasing sweting
increase metabolicrate
hair stands up
shivering
hair when cold
stick up
trap layer of air - insulate the body
hair when hot
lies flat
how does hair move
erector muscle contract
why do blood vessels contract
decrese heat loss
why do blood vessels dilate
increase heat loss
how is sweat produced
released from sweat pores
evaporate from the surface of skn which cools down the body
