3.2.1 Burn and Lymphatic System

1st Degree Burn – Causes

• Sunburn

• Brief contact with hot objects or liquids

1st Degree Burn – What It Looks Like

• Redness

• Mild swelling

• Pain

• Dry, without blisters

2nd Degree Burn – Causes

• Scalding from hot liquids

• Flames

• Brief contact with hot surfaces

2nd Degree Burn – What It Looks Like

• Red, swollen skin

• Blisters

• Wet or shiny appearance

• Severe pain

3rd Degree Burn – Causes

• Fire

• Prolonged contact with hot objects

• Electrical burns

• Chemical burns

3rd Degree Burn – What It Looks Like

• White, black, or charred skin

• Leathery texture

• No pain (due to nerve damage)

4th Degree Burn – Causes

• Prolonged exposure to flames or chemicals

• Electrical burn

4th Degree Burn – What It Looks Like

• Blackened, charred skin

• Damage extends to muscle, tendons, and bone

• No pain (due to nerve destruction)

lymphatic system role

transports lymph to drain int from cells and tissues

Lymph Nodes

• Filter lymph (fluid) to remove bacteria, viruses, and other harmful substances.

• Produce white blood cells (lymphocytes) to fight infection.

Lymph Vessels

• Transport lymph throughout the body.

• Carry white blood cells to areas of infection.

Spleen

• Filters blood to remove old or damaged red blood cells.

• Stores white blood cells and helps fight infections.

Tonsils

• Trap and destroy bacteria and viruses from the air and food.

• Produce white blood cells to fight infection.

Thymus

• Produces T-cells (a type of white blood cell) to fight infection.

• Helps develop the immune system in childhood.

• Bone Marrow

• Produces red and white blood cells and platelets.

• Source of B-cells (a type of white blood cell) to fight infection.

Liver

• Filters blood to remove toxins and bacteria.

• Produces proteins that help with blood clotting and immune response.