Lesson OverviewLesson Overview Skin - The Integumentary SystemSkin - The Integumentary System

Lesson OverviewLesson Overview32.3 Skin – 32.3 Skin –

The Integumentary SystemThe Integumentary System

Lesson OverviewLesson Overview Skin - The Integumentary SystemSkin - The Integumentary System

THINK ABOUT IT

What’s the largest organ in your body? By far it is the skin.

Lesson OverviewLesson Overview Skin - The Integumentary SystemSkin - The Integumentary System

Integumentary System Functions

• Includes the skin, hair, and nails. • Skin has many functions: most important is protection.

Lesson OverviewLesson Overview Skin - The Integumentary SystemSkin - The Integumentary System

Protection

• skin forms a barrier that blocks diseases and debris

• prevents the body from drying out

• Protection from the sun

-Contains melatonin, a dark pigment that absorbs UV rays from the sun

• Nails protect the tips of fingers and toes-made from skin

Lesson OverviewLesson Overview Skin - The Integumentary SystemSkin - The Integumentary System

Body Temperature Regulation

• The skin releases extra heat made by working cells, while keeping in enough heat to maintain normal body temperature.

• Releases sweat on hot days to keep cool• Hair helps prevent heat loss from the head.

Lesson OverviewLesson Overview Skin - The Integumentary SystemSkin - The Integumentary System

Excretion

• A small amount of sweat is constantly released from your sweat glands. • Sweat contains waste products such as salts that need to be excreted from the

body.

Lesson OverviewLesson Overview Skin - The Integumentary SystemSkin - The Integumentary System

Information Gathering

• The skin is a gateway that sensations such as pressure, heat, cold, and pain are sent from the outside to the nervous system.

Lesson OverviewLesson Overview Skin - The Integumentary SystemSkin - The Integumentary System

Vitamin D Production

• Produces vitamin D • Produced from absorbing sunligh