Life Science : 1.4

The Integumentary System

1. List four functions of skin.2. Describe the two layers of skin.3. Describe the structure and function of

hair and nails.4. Describe two kinds of damage that can

affect skin.

Objectives:

Integumentary systemOrgan system that forms a protective covering on the

outside of the body.Made up of your skin, hair, and nails.

1. Skin protects you by Keeping water in your body and foreign particles out

of your body.

2. Nerve endings in your skin let you Feel things around you.

3. Skin helps regulate Your body temperature.

4. Skin Also helps Get rid of waste chemicals in sweat.

MelaninDetermines color of skin

Functions of Skin

Epidermis Outermost layer of skin. Most cells in the epidermis are dead.Thick as only 2 sheets of paper.Keratin

Protein that makes skin tough.

Dermis Thicker layer of skin that lies beneath the

epidermis.Collagen

Protein fibers giving skin strength.

Layers of Skin

Hair helps Protect skin from ultraviolet light Regulate body temperature in most mammals.Keep particles out of eyes and nose.

A hair forms at the bottom of a tiny sac called a hair follicle.

Nails protect The tips of your fingers and toes.

A nail grows from living cells in the nail root at the base of the nail.

Hair and Nails

Skin is often damaged, but fortunately can repair itself.

However, damage to the genetic material in skin cells can cause skin cancer.

Skin Injuries