Transcript Diapositiva 1

o Outer, thinnest layer. Outermost cells are dead and
water repellent.
o Are below epidermis thicker than epidermis and
contain blood vessels. Nerves, muscles, oil. And
sweat glands and other structures.
o Insulates the region this is where most of the fat is
deposited, when a person gains weight . Also make
body get warm.
• Cells in the epiderms produce the chemical
melanin, a pigment that give protection to the skin
and gives its color.
oSensory response
oRegulation of body temperature
oRidding the body of the wastes
oSecrete fluids that destroy bacteria
oSlows water loss
oNerve cells detect and relay information to brain.
oProtection=physical, chemical
injuries… bacteria, diseases
oFormation of vitamin D=
ultraviolet light, epidermis… v.D
absorb calcium into blood from
food in your digestive tract.
oBlood vessels in skin release or hold heat, if blood vessels
dilate, blood flow increase, pores open to lead the sweat
glands and heat is release, but when blood vessels
constrict, less heat is going to be released.
oAdult’s dermis has about 3 million sweat glands where the
body tº is regulated and wastes are excrete.
oSweat is produced by muscle contractions.
oHeat transfers from the body to the sweat to the skin.
oSweat evaporates being released and cooling the skin.
o Wastes are produced when nutrients are broken down.
o A lot of water and salt release, cause extreme heat
o For regulation of the body temperature sweet gland release
wastes
o When skin is damage epidermis produce new cells
and dermis repair tears
o When skin is injured, diseases caused by organisms
can enter to the boy rapidly and an infection results
o Occurs when tiny blood vessels beneath the skin
break.
o Blood cells from the break vessels surround the
tissue.
o red blood cells release hemoglobin that then turns
on pigments.
o The body repair small injuries but not the big ones.
o When there’s not cells for big injuries pieces of skin are
removed from another part of the body and then the
blood vessels attach to the new piece of skin