a pigment that protects your skin and gives it color
100
What is the most important function of the skin?
protection
100
what is a cut defined as?
any tear in the skin
100
when would a skin graft be used?
when an injury is so large that not enough skin cells are left to divide and replace the lost layer
200
what are the 3 layers of the skin?
epidermis, dermis, fatty layer
200
why do people with lighter skin burn more easily?
they have less melanin so they have less protection from the skin
200
what is the function of the fatty layer?
insulates the body
200
where do bruises form?
underneath the skin
200
what happens when blood vessels expand?
blood flow increases and heat is released
300
what is the outer layer of skin called?
epidermis
300
what happens to your skin when exposed to ultraviolet rays?
melanin production increases and your skin becomes darker
300
what do sweat glands do?
helps regulate the body's temperature and excretes wastes
300
what does a scab do?
prevents bacteria from entering the body
300
what happens when blood vessels constrict?
less heat is released
400
what is the thickest layer of skin called?
the dermis
400
where is melanin produced?
in the epidermis
400
how are dead cells replaced aftery they are rubbed off the body?
new cells are produced at the base of the epidermis, move up to the outer part and replace those that were rubbed off
400
where are skin tears repaired?
in the dermis
400
name 4 things contained in the dermis.
blood vessels, nerves, muscles, oil, sweat glands
500
the skin is composed of layers of what?
tissue
500
what is hemoglobin?
a chemical that is released when blood cells break down
500
what are the 5 functions of the skin?
protection, sensory response, formation of vitamin D, regulation of body temperature, ridding wastes
500
explain the process of a skin graft.
1) pieces of skin are cut from one part of the body and moved to the injured area
2) skin is kept alive by nearby blood vessels
3) new skin becomes part of surrounding skin
500
why does a scar form?
because of large amounts of tissue fibers that form when a cut heals