Immune System Functions and Responses

What is the main job of your immune system?

• To help you digest food

• To protect your body from harmful germs

• To help your bones grow strong

• To make your heart pump blood

Which two main defense systems work together to protect your body?

• Digestive and Respiratory

• Skeletal and Muscular

• Innate and Adaptive

• Circulatory and Nervous

What is the body's first physical barrier against germs?

• Fever

• Skin

• Mucus

• Chemical signals

What are the cells that literally mean "to eat" and gobble up intruders?

• Lymphocytes

• Neutrophils

• Macrophages

• Phagocytes

How do Natural Killer cells identify and destroy cells that are infected or cancerous?

• They swallow the entire cell.

• They poke the cell with an enzyme to cause programmed cell death.

• They release antibodies to mark the cell for destruction.

• They change the cell's DNA to make it healthy again.

Which of the following are common signs of an inflammatory response in the body?

• Hunger, thirst, and fatigue.

• Redness, swelling, heat, and pain.

• Dizziness, blurred vision, and numbness.

• Sneezing, coughing, and runny nose.

What is one effect of histamine molecules released during an injury?

• They make blood vessels narrower.

• They cause blood vessels to widen, leading to redness and heat.

• They directly kill bacteria.

• They help form scabs.

Why does the body sometimes develop a fever when fighting an infection?

• To make you feel tired so you rest more.

• To increase the body's temperature, which helps cells heal faster and makes it harder for bacteria to grow.

• To signal other people that you are sick.

• To make you sweat and cool down.