The Integumentary

System

Skin• The largest organ in your body• Functions

• Covers the body and prevents water loss• Protects the body from injury and infection• Regulates body temperature• Eliminates wastes (sweat)• Produces vitamin D• Gathers information about the environment• Stores fat for fuel and insulation

Organs of the integumentary system

skinhairnails

The name is derived from the Latin integumentum, which means “a covering.”

Label and color the parts of the integumentary system

finger nail

Prevents Water Loss

Skin prevents water from leaking out of your body.

Prevents Infection

Skins acts as a barrier to bacteria and viruses.

Eliminates Waste

Sweating eliminates dissolved waste from your body.

Gathers Information

Skin contains nerves that can feel pain or pressure.

Provide Vitamin D

With the help of sunlight, your skin produces vitamin D

Vitamin D is essential in calcium absorption from food

Maintains Homeostasis

Helps to keep the body temperature normal

Has blood vessels that tell the body when it is hot or coldHot – blood vessels get larger and sweating

occursCold – blood vessels constrict to keep blood

in the body’s core

Layers of Skin

Skin consists of three main layersepidermisdermissubcutaneous layer

subcutaneous layer

EpidermisEpidermis – the upper layer of skin where nails

grow and where melanin in located.Every minute, 30,000 - 40,000 skin cells fall off95% of your skin cells make new cells5% make melanin

More sun exposure = more melanin (tan)

dermis - middle layer of skin that contains nerves, blood vessels, sweat glands, oil glands and hair follicles.

subcutaneous layer – acts as a fat storage to provide warmth and to absorb shock.

hairMade of a strong, dead protein, called

keratin.Grows out of a tiny tube called a

follicle.Hair growth is caused by rapid mitosis

in the follicle.Hair follicles are everywhere except

lipspalmssoles

hair

Over 100,000 follicles on the scalp.Each follicle is attached to a gland that

secretes sebum (oil).Color is partially determined by

melanin.

nails

Modified hair that grows from your cuticle.

Made of keratin.No nerve endings.Protects the end of fingers and toesTakes 6 months to grow from cuticle to

tip.

nails

Fingernails grow faster than toenails.Nails grow faster on your dominant

hand.Nails DO NOT grow after death!

Body systems that work with the integumentary system;respiratory system to get oxygen

and remove carbon dioxide.circulatory system to deliver

oxygen.excretory system to eliminate

waste.

The integumentary system is similar to the cell membrane in a cell.

https://www.youtube.com/watch?v=z5VnOS9Ke3g