The Immune System

What is activated in the third defense system?

• Macrophages are activated.
• Neutrophils are activated.
• Antibodies are activated.
• Lymphocytes (T cells and B cells) are activated.

What do white blood cells do?

• White blood cells fight the pathogens.

• White blood cells transport oxygen throughout the body.
• White blood cells are responsible for producing hormones.
• White blood cells help in digestion and nutrient absorption.

What is the job of the T-cells?

• To tell one pathogen from the other. It recognizes the antigen, divides many times, and either attacks or activates B cells.

• T-cells help in digestion and nutrient absorption.
• T-cells are responsible for oxygen transport in the blood.
• T-cells produce antibodies to fight infections.

Why do we get fevers?

• The warmer temperature of your body make it difficult for pathogens to reproduce.

• Fevers occur when the body is too cold.
• Fevers are caused by eating spicy food.
• Fevers are a sign of aging.

What is the inflammatory response (second line of defense)?

• The body leaks fluids and certain types of white blood cells. The white blood cells fight pathogens.

• The inflammatory response is the body's first line of defense against infection.
• The inflammatory response is a type of antibody produced by the immune system.
• The inflammatory response is solely responsible for healing wounds.

How does your stomach protect you from getting sick?

• The stomach protects you by producing acid that kills pathogens.

• The stomach produces enzymes that enhance digestion.
• The stomach filters toxins from the bloodstream.
• The stomach absorbs nutrients to prevent illness.

What traps pathogens in your breathing passages?

• skin

• blood

• Mucus, hairs, cilia, saliva

• Dust particles

How does your skin destroy pathogens?

• The skin absorbs pathogens to eliminate them.
• The skin produces heat to kill pathogens.
• The skin destroys pathogens through oil and sweat that contains chemicals to kill pathogens.

• The skin secretes hormones to neutralize pathogens.

What makes up the first line of defense in the immune system?

• Lymph nodes
• Antibodies
• White blood cells
• Skin and breathing passages

What is the job of the B-cell?

• To transport oxygen in the blood.
• To regulate blood sugar levels.
• To digest food in the stomach.
• The job of the B-cell is to produce antibodies to destroy the pathogen.