o Outer, thinnest layer. Outermost cells are dead and water repellent. o Are below epidermis thicker...

…Skin...

o Outer, thinnest layer. Outermost cells are dead and water repellent.

o Are below epidermis thicker than epidermis and contain blood vessels. Nerves, muscles, oil. And

sweat glands and other structures.

3 layers of skin

dermis

epidermis

o Insulates the region this is where most of the fat is deposited, when a person gains weight . Also make body get warm.

Fatty layers

• Cells in the epiderms produce the chemical melanin, a pigment that give protection to the skin and gives its color.

melanin

Functions…oSensory response

oRegulation of body temperature

oRidding the body of the wastes

oSecrete fluids that destroy bacteria

oSlows water loss

oNerve cells detect and relay information to brain.

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oProtection=physical, chemical injuries… bacteria, diseases

o Formation of vitamin D= ultraviolet light, epidermis…

v.D absorb calcium into blood from food in your digestive

tract.

Protection

Vitamin d

Heat and waste exchage…

oBlood vessels in skin release or hold heat, if blood vessels dilate, blood flow increase, pores open to lead the sweat glands and heat is release, but when blood vessels constrict, less heat is going to be released.

oAdult’s dermis has about 3 million sweat glands where the body tº is regulated and wastes are excrete.

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oSweat is produced by muscle contractions.

oHeat transfers from the body to the sweat to the skin.

oSweat evaporates being released and cooling the skin.

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o Wastes are produced when nutrients are broken down.

o A lot of water and salt release, cause extreme heat

o For regulation of the body temperature sweet gland release wastes

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o When skin is damage epidermis produce new cells and dermis repair tears

o When skin is injured, diseases caused by organisms can enter to the boy rapidly and an infection results

Skin injuries and repair

o Occurs when tiny blood vessels beneath the skin break.

o Blood cells from the break vessels surround the tissue.

o red blood cells release hemoglobin that then turns on pigments.

bruises

o The body repair small injuries but not the big ones.

o When there’s not cells for big injuries pieces of skin are removed from another part of the body and then the blood vessels attach to the new piece of skin

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Laura cristancho

Camila Caicedo

Jaime cocunubo

References…

Glencoe,science,levelgreen,

mc graw hill