50+ the immune system worksheets on Quizizz | Free & Printable - Free Printable

Let’s go through each question one by one and find the correct answer.

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Question 1:
*Any organism that causes disease like a virus or bacteria is called:*

- A. Phagocyte → That’s a type of white blood cell that eats germs. Not the germ itself.
- B. Antibiotics → These are medicines that kill bacteria. Not organisms.
- C. Antibody → These are proteins made by your body to fight germs. Not the germ.
- D. Pathogen → YES! This is the scientific word for any disease-causing organism — viruses, bacteria, fungi, etc.

✔ Correct Answer: D. Pathogen

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Question 2:
*Part of the body's defense against pathogens, in which fluid and white blood cells leak from blood vessels into tissues and destroy pathogens by breaking them down?*

This describes swelling, redness, heat — classic signs of inflammation. White blood cells rush in to eat up invaders.

- A. Inflammatory response → YES! That’s exactly what this is.
- B. Stomach acid → Kills germs in food, but not related to leaking fluids into tissues.
- C. Protective barrier → Like skin or mucus — first line of defense, not involving leaked fluids.
- D. Immune response → Too broad. The inflammatory response is PART of the immune response, but this question is describing inflammation specifically.

✔ Correct Answer: A. Inflammatory response

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Question 3:
*A white blood cell that destroys pathogens by engulfing them and breaking them down is called:*

“Engulfing” means eating them whole — that’s phagocytosis.

- A. B-cell → Makes antibodies. Doesn’t eat germs.
- B. Phagocyte → YES! “Phago” = eat, “cyte” = cell. Eats pathogens.
- C. Antibody → Protein, not a cell.
- D. Antigen → Something on the surface of a pathogen that triggers an immune response. Not a cell.

✔ Correct Answer: B. Phagocyte

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Question 4:
*Part of the body's defense against pathogens in which cells of the immune system react to each kind of pathogen with a defense targeted specifically at that pathogen is called:*

This is talking about specificity — like how your body makes special weapons (antibodies) for each invader.

- A. Inflammatory Response → General reaction, not specific.
- B. Protective Barrier → First line, non-specific.
- C. Stomach acid → Also non-specific.
- D. Immune Response → YES! Especially the *adaptive* part — it targets specific pathogens.

Note: Sometimes people say “specific immune response,” but here “Immune Response” is the best match among options.

✔ Correct Answer: D. Immune Response

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Question 5:
*A molecule that the immune system recognizes either as part of the body or as coming from outside the body:*

Your immune system checks molecules to see if they’re “self” or “non-self.” Foreign ones trigger a response.

- A. Antibiotics → Drugs, not recognized by immune system as self/non-self.
- B. Antipaths → Not a real term.
- C. Antibodies → Made BY the immune system to attack things.
- D. Antigen → YES! Antigens are markers on cells/viruses/bacteria that tell the immune system “I’m foreign!” or “I’m you.”

✔ Correct Answer: D. Antigen

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Question 6:
*A protein produced by B cells of the immune system that destroys pathogens is called:*

B cells make Y-shaped proteins that stick to antigens and help destroy them.

- A. Antigens → Markers on pathogens, not made by B cells.
- B. Antibodies → YES! Made by B cells to neutralize or tag pathogens.

✔ Correct Answer: B. Antibodies

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Final Answer:

1. D
2. A
3. B
4. D
5. D
6. B