Blood Types Worksheet 2 - Notability Gallery - Free Printable

Let’s go step by step through each question on the worksheet. I’ll check each answer carefully and make sure it’s correct based on how blood types work.

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Question 1: What is an antigen?

Antigens are proteins (or sometimes sugars) found on the surface of red blood cells. They determine your blood type — like A, B, AB, or O. For example, if you have type A blood, your red blood cells have A antigens.

✔ Correct answer: Antigens are markers on the surface of red blood cells that define your blood type.

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Question 2: What is an antibody?

Antibodies are made by white blood cells. They float in your plasma (the liquid part of blood). Their job is to attack foreign things — like bacteria, viruses, or even mismatched blood cells during a transfusion. If your body sees an antigen it doesn’t recognize (like someone with type A blood getting type B blood), antibodies will attack those “foreign” cells.

✔ Correct answer: Antibodies are proteins made by white blood cells that travel in the bloodstream and attack foreign antigens.

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Question 3: What happens in agglutination? Why can it be deadly?

Agglutination means clumping. When incompatible blood mixes, antibodies bind to the wrong antigens on red blood cells, causing them to stick together in clumps. These clumps can block small blood vessels, stopping oxygen from reaching tissues. That can cause organ damage or death.

✔ Correct answer: Agglutination is when red blood cells clump together because antibodies attach to foreign antigens. It’s deadly because clots can block blood flow to organs.

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Question 4: Patient has type AB blood. Receives type B blood. Predict and explain.

Type AB blood has both A and B antigens on its red blood cells. People with AB blood do NOT make anti-A or anti-B antibodies — so they can receive any blood type (they’re universal recipients).

So if an AB patient gets type B blood, their body won’t attack it — no antibodies against B antigen. The transfusion should work fine.

✔ Correct answer: Yes, it would work. Type AB patients have no antibodies against A or B antigens, so they can safely receive type B blood.

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Question 5: Patient has type B blood. Receives type AB blood. Predict and explain.

Type B blood has B antigens and makes anti-A antibodies (because it doesn’t have A antigens, so it attacks them).

Type AB blood has BOTH A and B antigens. So when you give AB blood to a type B person, the recipient’s anti-A antibodies will attack the A antigens on the donor’s red blood cells → agglutination → hemolysis → dangerous!

✔ Correct answer: No, this would be dangerous. The patient’s anti-A antibodies will attack the A antigens in the AB blood, causing agglutination and possibly killing the patient.

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Question 6: Patient has type O blood. Receives type A blood. Predict and explain.

Type O blood has NO antigens on red blood cells, but it makes BOTH anti-A and anti-B antibodies.

If you give type A blood (which has A antigens) to a type O patient, the patient’s anti-A antibodies will immediately attack the A antigens → massive agglutination → very dangerous.

Also, note: White blood cells don’t kill antigens — antibodies do. So the handwritten answer saying “white blood cell will kill the antigens” is incorrect. It’s the antibodies floating in plasma that cause the reaction.

✔ Correct answer: This would be deadly. Type O patients have anti-A antibodies that will attack the A antigens in the donated blood, causing severe agglutination.

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Question 7: Patient has type A blood. Needs transfusion. Which blood types are compatible?

Type A blood has A antigens and makes anti-B antibodies.

So they can only receive blood that does NOT have B antigens — meaning:

- Type A (has A antigen, no B → safe)
- Type O (no antigens at all → safe)

They CANNOT receive:
- Type B (has B antigen → attacked by anti-B)
- Type AB (has both A and B → B antigen will be attacked)

Wait — the student wrote “AB, A” — that’s WRONG. AB has B antigen, which type A patients will attack.

Also, the student crossed out “A, O” — but that’s actually CORRECT.

Let me double-check:

Recipient: Type A → has anti-B antibodies → cannot accept anything with B antigen.

Donor options:
- Type A → OK (same as recipient)
- Type O → OK (universal donor, no antigens)
- Type B → NO (has B antigen)
- Type AB → NO (has B antigen)

✔ Correct answer: Compatible donors for type A patient are Type A and Type O.

The student originally had “A, O” written — that’s right. Then they changed it to “AB, A” — which is wrong. We need to correct that.

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Now let’s compile the final corrected answers clearly.

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Final Answer:

1. An antigen is a protein (or sugar) marker on the surface of red blood cells that determines your blood type (like A, B, etc.).

2. An antibody is a protein made by white blood cells that floats in the blood and attacks foreign antigens (like mismatched blood cells).

3. Agglutination is when red blood cells clump together because antibodies bind to foreign antigens. It’s deadly because these clumps can block blood vessels and stop oxygen delivery to organs.

4. Yes, it would work. A person with type AB blood has no antibodies against A or B antigens, so they can safely receive type B blood.

5. No, it would be dangerous. A person with type B blood has anti-A antibodies that will attack the A antigens in type AB blood, causing agglutination and possible death.

6. It would be deadly. A person with type O blood has anti-A antibodies that will attack the A antigens in type A donor blood, causing severe agglutination. (Note: Antibodies—not white blood cells—cause this reaction.)

7. Compatible blood types for a type A patient are: Type A and Type O.
*(Correction: Type AB is NOT compatible because it contains B antigens, which the patient’s anti-B antibodies will attack.)*