11.1-11.2 Flashcards
(59 cards)
a stable internal environment
Homeostasis
designed for homeostasis; also known as skin
Integumentary system
organ of integumentary system; covers the outside of the body
Skin
Three purposes of skin
Communication
Secretion
Protection
Sense receptors in the skin notify the brain of conditions affecting the body
Communication
provides moisture (sweat) to cool the body and oil to keep it from drying out
Secretion
prevents harmful microorganisms and chemicals from reaching delicate tissues beneath it
Protection
Italian scientist that learned of the design of the integumentary system through his microscopic studies
Marcello Malpighi
outer layer of skin; part of the skin that is exposed to the environment
Epidermis
outermost cells of the epidermis
Squamous epithelial cells
living cells that rapidly reproduce
Germinative cells
a buildup of epidermal cells
Callus
results when the immune system attacks epidermal cells, causing them to be formed and discarded too rapidly
Psoriasis
When the epidermal cells of the scalp replenish themselves too rapidly, and the dead skin cells begin to flake
Dandruff
tough, waterproof protein fiber that strengthens and hardens skin cells
Keratin
main pigment responsible for skin color
Melanin
do not produce melanin
Albinism
layer of skin below epidermis
dermis
protein fiber in the dermis that gives skin its ability to stretch and its elasticity
Elastin
tough, resilient protein fiber that reinforces bone
Collagen
fatty layer of loose connective tissue beneath the dermis
Subcutaneous layer
too much exposure to sun
Sunburn
cancer caused by overexposure to sun rays
Skin cancer
protects skin of ultraviolet rays
tanning
