Integumentary System.

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Integumentary System A system An organ The biggest!
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Presentation transcript:

Integumentary System

Skin! Body’s largest organ Consists of two layers: epidermis and the dermis

Functions Protection Prevention of water loss Temperature regulation Metabolic regulation Immune defense Sensory reception Excretion

Epidermis -Outermost layer -Stratified squamous epithelial cells Avascular! -Basement membrane separates the epidermis from the dermis

Epidermis continued 5 layers -Stratum basale Attached to basement membrane Get enough nourishment to grow and divide  *As move towards top layers, cells begin to undergo keratinization

Epidermis layers continued  Stratum spinosum  Stratum granulosum  Stratum lucidum  Stratum corneum  -Top-most layer  -Dead cells filled with keratin for protection  -Cells eventually shed Thickest on soles and palms (0.8-1.4 mm thick)

Specialized epidermal cell= Melanocyte! Produces granules of melanin  Skin tone!  Absorbs UV light to protect

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