Understanding the Immune System

What is the main job of the immune system?

• To help you grow taller.

• To protect your body from sickness and disease.

• To make your bones strong.

• To help you digest food.

What is the first layer of defense against infection in our body?

• White blood cells

• Lymph system

• Skin

• Circulatory system

Which type of white blood cell is responsible for seeking out and destroying germs and bacteria in the blood?

• Macrophages

• Lymphocytes

• Neutrophils

• Red blood cells

Which type of white blood cell produces antibodies to fight germs?

• T-cells

• B-cells

• Macrophages

• Neutrophils

What is the role of memory cells in the immune system?

• To help the body grow.

• To remember past germs and fight them off if they return.

• To carry oxygen throughout the body.

• To digest food.

What happens to your lymph nodes when you have a sore throat?

• They disappear.

• They get smaller.

• They feel swollen.

• They turn blue.

What is true about germs in our bodies?

• All germs are harmful.

• Some germs can help make our immune system stronger.

• Germs only make us sick.

• Germs are not found in healthy bodies.

How do vaccines help your body fight off diseases?

• They make you sick with the real disease.

• They introduce a strong virus that fights other viruses.

• They train your immune system with a weak virus.

• They remove all germs from your body.

What is an autoimmune disease?

• When the body's immune system attacks harmful germs.

• When the body's immune system attacks healthy cells by mistake.

• When the body's immune system becomes too weak to fight diseases.

• When the body's immune system causes allergies.

Which of these actions helps keep your immune system strong?

• Eating only sugary foods.

• Getting very little sleep.

• Washing your hands regularly.

• Avoiding all exercise.