That Amazing That Amazing Organ:Organ:

That Amazing That Amazing Organ:Organ:

The Skin!The Skin!The Skin!The Skin!

Functions of Skin:Functions of Skin:Functions of Skin:Functions of Skin:oCovers the body and prevents Covers the body and prevents

water losswater lossoProtects body against injury or Protects body against injury or

infectioninfectionoHelps regulate body temps.Helps regulate body temps.oEliminates wastesEliminates wastesoGather info about the Gather info about the

surrounding environ.surrounding environ.oProduces vitamin DProduces vitamin D

oCovers the body and prevents Covers the body and prevents water losswater loss

oProtects body against injury or Protects body against injury or infectioninfection

oHelps regulate body temps.Helps regulate body temps.oEliminates wastesEliminates wastesoGather info about the Gather info about the

surrounding environ.surrounding environ.oProduces vitamin DProduces vitamin D

Structure of Skin:Structure of Skin:

The following are the two The following are the two main layers of skin: ( on the main layers of skin: ( on the next slide!)next slide!)

The The EpidermisEpidermis: skin: skin’’s s upper layerupper layer

o Has no blood vessels or nervesHas no blood vessels or nerveso Is made up of flattened, dead cells Is made up of flattened, dead cells

which protect you from the environ. which protect you from the environ. It It protectsprotects you you twotwo ways: ways:

1.)1.) the layer of dead cells forms a the layer of dead cells forms a shield-like barrier against germs.shield-like barrier against germs.

2.)2.) as these dead cells flake off as these dead cells flake off they carry germs stuck to them they carry germs stuck to them with them.with them.

The Epidermis (cont.)•Cells deep in the epidermis Cells deep in the epidermis

produce produce melanin,melanin, a brown a brown pigment that pigment that gives skin its gives skin its colorcolor and and protects against protects against the sun’s UV rays.the sun’s UV rays. The more The more melanin produced here, the melanin produced here, the darker your tan (or skin darker your tan (or skin color).color).

The Dermis: skins The Dermis: skins lowest layerlowest layerThe Dermis: skins The Dermis: skins lowest layerlowest layer Contains Contains nervesnerves and and blood vesselsblood vessels

Also contains these structures: Also contains these structures: **sweat glandssweat glands produce sweat produce sweat which is secreted by pores, which is secreted by pores, cooling the bodycooling the body

** Grows Grows hairhair within structures within structures called called folliclesfollicles (hair is made of (hair is made of dead skin cells).dead skin cells).

** Oil glandsOil glands which keeps skin which keeps skin moist.moist.

Contains Contains nervesnerves and and blood vesselsblood vessels Also contains these structures: Also contains these structures:

**sweat glandssweat glands produce sweat produce sweat which is secreted by pores, which is secreted by pores, cooling the bodycooling the body

** Grows Grows hairhair within structures within structures called called folliclesfollicles (hair is made of (hair is made of dead skin cells).dead skin cells).

** Oil glandsOil glands which keeps skin which keeps skin moist.moist.

Care for SkinCare for Skin

Eat properlyEat properlyDrink plenty of waterDrink plenty of waterLimit sun exposure-too much Limit sun exposure-too much

causes skin cancercauses skin cancerKeep skin clean and dryKeep skin clean and dry *clogged pores cause acne*clogged pores cause acne *fungi like athlete’s foot grow in *fungi like athlete’s foot grow in

warm,moist environ. Keeping skin warm,moist environ. Keeping skin clean and dry prevents its growth.clean and dry prevents its growth.