INTEGUMENTARY SYSTEM

skin

Components of the integumentary system

SkinHairNailsGlands

Skin is the human body’s largest organ

The #1 function of skin

PROTECTION

How Skin Protects the BodyBarrier against infection and

injuryHelp regulate body temperatureRemove waste productsProvide protection against UV

radiation from the sunProduce Vitamin D

Skin also transmits sensations like…PressureHeatColdPain

Cool facts about skin Waterproof Self-repairing Keeps germs and water OUT Keeps body fluids (like blood) and salts

IN Sweat is a way to get rid of unneeded

chemicals Skin is alive and renews the top layer

about once a month

Layers of the skin Top layer

Epidermis

Middle layer Dermis

Bottom layer Subcutaneous

layer

What is in the Epidermis?Epithelial TissueOuter layer of dead cellsMelanocytes

Produce melanin – a dark brown pigment (color)

Pores

What is in the Dermis?Living cellsBlood vesselsHair folliclesNerve endingsMuscles Glands

The Two Main Glands in SkinSweat glands

Release sweat to cool bodySebaceous (oil) glands

Keeps skin softWaterproof skinProtect against germs

Muscles in Skin???The tiny muscles attached to hair follicles cause “goose bumps” when they contract and pull the hair upright

What is in the Subcutaneous Layer???FatConnective tissueBlood vessels

The job of the subcutaneous layerTo cushion the body’s

internal organs from blows and bumps