1

•Why do humans have skin?

Name AT LEAST 3 reasons.

2

3

•Name the parts of the Integumentary

system and discuss the function of each part.

4

Skin is the largest organ of the body, and

serves to:

•Protect other organs and

tissues

•Maintain body temperature

•Excrete waste materials

through perspiration (sweat)

•Function as a sense organ

•Produce Vitamin D

5

Three Main Layers of Skin

A. Epidermis – outer

most layer

B. Dermis – Nerves,

vessels, glands, hair

follicles

C. Hypodermis –

attaches skin to body,

composed of fat for

warmth

6

Hair - Epidermis

•Hair grows out of the epidermis to cover parts of

the body.

•The shaft is what we see and the root attaches

to the muscle in the dermis.

Hair color is determined by the presence

of melanin.

Baldness or alopecia may result from

heredity, disease, injury, or

chemotherapy.

7

Nails - Epidermis

•Nails are plates

made of hard keratin

that cover the dorsal

surface of the fingers

and toes.

•At the base of most nails a lunula or whitish

half-moon is an area where keratin and other

cells have mixed with air.

•The cuticle is a narrow band of epidermis that

surrounds the base or bottom of nails.

8

Glands - Dermis

•Sweat glands

release waste which

cools the skin.

•Oil Glands moisten the skin and make it flexible

9

The field dermatology is the study, diagnosis and

treatment of ailments to the skin

10

Did you know that the skin can be

tested for various diseases and

allergies?

Tests for Allergies

•Patch test

•Scratch test

•Intradermal tests

Tests for Diseases

•Mantoux test used to

detect tuberculosis.

•Schick test used to

detect diptheria.

11

Fun Facts

Skin is the largest organ in your

body

Your skin contains millions of

sensory receptors

You lose 30,000-40,000 dead

skin cells every minute!