The Skin This is gonna cover EVERYTHING Mr. Sanders

Da Skin The skin is the outer covering of the body Skin Facts It is the largest organ of the body. The adult skin has enough surface area to cover a twin bed!

Integumentary System The integumentary system includes: Skin Hair Nails Oil glands Sweat glands

Skin Functions Five functions of the skin Protection Maintaining Body Temperature Waste Elimination Sensation Vitamin D Production

Skin Functions Protection Skin acts as a barrier between the outside world and the human body. Protects against injury and harmful UV light.

Skin Functions Maintaining body temperature Body heat is lost through the skin. The skin regulates body temperature by the blood vessels and by sweating. Vessels dilate to give off more heat (flushing). They contract to hold it in. Sweat evaporates taking heat with it.

Skin Functions Waste elimination The skin helps eliminate wastes by perspiration (sweating). It contains waste from the body processes.

Skin Functions Sensation The nerves in you skin send messages about the environment back to the brain.

Skin Functions Production of Vitamin D The skin produces Vitamin D from sunlight. This vitamin is important for the healthy development of bones

Structure of the Skin Three Layers Outer Layer – Epidermis Inner Layer – Dermis Fat Layer

Structure of the Skin Three Layers Epidermis is made out of dead skin cells. It contains melanin. A pigment that absorbs UV light and gives skin its tone.

Structure of the Skin Three Layers The dermis contains everything else: hair follicles, nerves, blood vessels, sweat and oil glands.

Structure of the Skin Three Layers The fat layer provides insulation and padding in the skin for the internal organs.

A Bodily Horror A common disease of the skin is acne.

A Bodily Horror It is caused when bacteria infect blocked oil glands.

Bibliography Pearson Interactive Science Google Images