Integumentary System Integumentary System Consists of Consists of skin skin hair hair glands glands nails nails Largest organ of Largest organ of the human body the the human body the Skin accounts for Skin accounts for 16% of the bodies 16% of the bodies mass! mass!
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Integumentary System Consists of Consists of skin skin hair hair glands glands nails nails Largest organ of the human body the Largest organ of the human.
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Integumentary SystemIntegumentary System
Consists of Consists of skinskin hair hair glandsglands nailsnails
Largest organ of the Largest organ of the human body the human body the
Skin accounts for 16% Skin accounts for 16% of the bodies mass!of the bodies mass!
Calcium absorptionCalcium absorption For bonesFor bones For muscle For muscle
contractioncontraction
5.5. Excretion of Excretion of WastesWastes
sweatsweat
FunctionsFunctions
Subcutaneous(Hypodermis)
Dermis
Epidermis
Dermis
Skin Cross Section
Epiderm
is
The epidermis is divided into two layers, dead and living cells.
Dead
Living
Living cells of the epidermis replicate, Living cells of the epidermis replicate, pushing their way towards the surface.pushing their way towards the surface.
The cells flatten and the organelles The cells flatten and the organelles disintegrate.disintegrate.
Eventually the living cells of the Eventually the living cells of the inner epidermis become the dead, inner epidermis become the dead, tough, waterproof, and flexible tough, waterproof, and flexible outer layer.outer layer.
As the living cells replicate they As the living cells replicate they produce produce
keratinkeratin and and melaninmelanin..
KeratinKeratin tough tough fibrous proteinfibrous protein
for for strengthstrength and a and a waterproofwaterproof texture. texture.
MelaninMelanin dark brown dark brown pigmentpigment
accounts for the variations in accounts for the variations in skin colorskin color..