1. In- Out- What is the lARGEST organ in your body?
Analyze the role of Melanin in the body.

2. Skin-Your largest organ
Three layers of tissue
Epidermis-
Dermis-
Fatty - layer
The epidermis is the thinnest layer of the skin. Its outermost cells are dead, New cells are made to replace the dead cells.
The dermis is the layer of cells directly below the epidermis. It contains many blood vessels, nerves, muscles, oil glands, and sweat glands.
The fatty layer insulates the body and is where fat is deposited when a person gains weight.

3. Five primary functions of the skin
Protection
Sensory response
Formation of vitamin D
Ridding the body of wastes
Control of body temperature

4. FYI
Melanin- protects the skin and gives it color. When the skin is exposed to ultraviolet (UV) rays, more melanin is made. This makes the skin darker. The lighter a person’s normal skin color, the less protection that person’s skin has from the Sun.
Bruises form- a bruise forms after blood vessels under the skin burst. The cells break down and release hemoglobin, which breaks down into pigments. The yellow color is the breakdown of pigment in red blood cells.

5. The steps as a cut heals A cut occurs in the skin.
Blood flows from the cut.
A clot forms over the cut.
A scab forms.
Cells fight infection.
The scab falls off, leaving new skin.

6. Why are people with sever burns or other damage to large areas of their skin are especially vulnerable to infections
The skin of burn patients is too damaged to protect the body from bacteria. This increases the risk of infections. Skin grafts cover the body and prevent bacteria from entering.