Understanding the Immune System

What is the main function of the immune system in the human body?

• To help digest food

• To prevent and fight infections

• To pump blood

• To control movement

Which of the following is a component of the immune system?

• Red blood cells

• White blood cells

• Platelets

• Neurons

What are antibodies?

• Hormones that regulate growth

• Proteins that recognize infectious agents

• Enzymes that digest food

• Cells that carry oxygen

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Which type of blood cell is primarily responsible for fighting infections?

• Red blood cells

• White blood cells

• Platelets

• Plasma cells

What is the role of antibodies in the immune system?

• They transport oxygen

• They help the body resist infection

• They produce energy

• They break down food

Which of the following best describes vaccination?

• A process of removing toxins from the body

• A method to introduce a harmless form of a disease to stimulate immunity

• A way to increase muscle strength

• A technique to improve digestion

What is the main purpose of immunization?

• To cure diseases instantly

• To prevent diseases by building immunity

• To increase appetite

• To improve eyesight

Which statement best explains how white blood cells help the body?

• They carry nutrients to cells

• They fight infection by attacking harmful organisms

• They store fat for energy

• They produce digestive enzymes

How do antibodies help the immune system respond to an infection?

• By breaking down food particles

• By recognizing and binding to specific disease agents

• By transporting waste out of the body

• By producing hormones

Why is it important for the immune system to recognize infectious agents?

• So it can ignore them

• So it can target and destroy them

• So it can help them multiply

• So it can store them for later use

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