Components of blood (Test) worksheet - Free Printable
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Step-by-step solution for: Components of blood (Test) worksheet
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Show Answer Key & Explanations
Step-by-step solution for: Components of blood (Test) worksheet
Let’s go through each question one by one, using the word bank at the top to help us fill in the blanks correctly.
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1. The main components of the blood are ________________, ________________, ________________ and ________________.
Blood is made up of four main parts:
- Red Blood Cells (carry oxygen)
- White Blood Cells (fight infection)
- Platelets (help clotting)
- Plasma (the liquid part)
✔ So we write: Red Blood Cells, White Blood Cells, Platelets, Plasma
*(Note: You could also say “Erythrocytes, Leukocytes, Thrombocytes, Plasma” — but since the question says “main components,” and the word bank includes both common and scientific names, it’s safer to use the more familiar terms unless specified. But looking ahead, some questions ask for alternate names — so let’s stick with the basic ones here.)*
Actually, let’s check the word bank again:
It has: Red Blood Cells, Thrombocytes, Bone Marrow, White Blood Cells, Leukocytes, Platelets, Plasma, Hemoglobin, Erythrocytes, Water.
So “Platelets” and “Thrombocytes” are the same thing. Same with “White Blood Cells” and “Leukocytes”, and “Red Blood Cells” and “Erythrocytes”.
But for Q1, they want the 4 MAIN COMPONENTS — which are:
→ Red Blood Cells
→ White Blood Cells
→ Platelets
→ Plasma
Yes.
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2. All blood cells are produced in the ________________.
This is a fact: Blood cells are made in the Bone Marrow.
✔ Answer: Bone Marrow
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3. ________________ helps carry oxygen and remove carbon dioxide.
That’s the job of Red Blood Cells — specifically because they contain hemoglobin.
But the blank is asking for what *helps* carry oxygen — so either “Red Blood Cells” or “Hemoglobin”. Let’s see context.
Later, Q13 asks about the protein that attaches to oxygen — that’s hemoglobin.
So here, Q3 is probably referring to the cell type: Red Blood Cells
✔ Answer: Red Blood Cells
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4. ________________ is a light yellow fluid that carries nutrients to all parts of the body.
That’s describing Plasma — the liquid part of blood.
✔ Answer: Plasma
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5. ________________ Help fight infections and diseases.
That’s the job of White Blood Cells
✔ Answer: White Blood Cells
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6. Red blood cells are also called ________________.
Scientific name: Erythrocytes
✔ Answer: Erythrocytes
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7. ________________ help with blood clotting.
That’s Platelets (also called thrombocytes)
✔ Answer: Platelets
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8. White blood cells are also called ________________.
Scientific name: Leukocytes
✔ Answer: Leukocytes
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9. Platelets are also called ________________.
Scientific name: Thrombocytes
✔ Answer: Thrombocytes
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10. Red blood cells live up to ________________ months.
Standard biology fact: RBCs live about 4 months (or 120 days).
✔ Answer: 4
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11. There are ________________ components of blood.
We said earlier: 4 main components — RBCs, WBCs, Platelets, Plasma.
✔ Answer: 4
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12. ________________ are the biggest of all the blood cells.
White Blood Cells are larger than Red Blood Cells and Platelets.
✔ Answer: White Blood Cells
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13. Red blood cells have a protein that attaches itself to oxygen molecules and it is called ________________.
That’s Hemoglobin
✔ Answer: Hemoglobin
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14. Plasma is mostly made up of ________________.
Plasma is about 90% water.
✔ Answer: Water
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15. These are small flat, shaped like a doughnut without a hole ________________.
Description matches Red Blood Cells — they’re biconcave discs, often described as “doughnut-shaped without a hole”.
✔ Answer: Red Blood Cells
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Now let’s double-check any tricky ones:
Q1: Main components — yes, 4: RBC, WBC, Platelets, Plasma → correct.
Q3: Could someone argue “Hemoglobin”? But the sentence says “helps carry oxygen” — RBCs do the carrying; hemoglobin is inside them doing the binding. Since Q13 specifically asks for the protein, Q3 should be RBCs.
Q15: “shaped like a doughnut without a hole” — definitely RBCs.
All answers match standard middle/high school biology.
---
Final Answer:
1. Red Blood Cells, White Blood Cells, Platelets, Plasma
2. Bone Marrow
3. Red Blood Cells
4. Plasma
5. White Blood Cells
6. Erythrocytes
7. Platelets
8. Leukocytes
9. Thrombocytes
10. 4
11. 4
12. White Blood Cells
13. Hemoglobin
14. Water
15. Red Blood Cells
---
1. The main components of the blood are ________________, ________________, ________________ and ________________.
Blood is made up of four main parts:
- Red Blood Cells (carry oxygen)
- White Blood Cells (fight infection)
- Platelets (help clotting)
- Plasma (the liquid part)
✔ So we write: Red Blood Cells, White Blood Cells, Platelets, Plasma
*(Note: You could also say “Erythrocytes, Leukocytes, Thrombocytes, Plasma” — but since the question says “main components,” and the word bank includes both common and scientific names, it’s safer to use the more familiar terms unless specified. But looking ahead, some questions ask for alternate names — so let’s stick with the basic ones here.)*
Actually, let’s check the word bank again:
It has: Red Blood Cells, Thrombocytes, Bone Marrow, White Blood Cells, Leukocytes, Platelets, Plasma, Hemoglobin, Erythrocytes, Water.
So “Platelets” and “Thrombocytes” are the same thing. Same with “White Blood Cells” and “Leukocytes”, and “Red Blood Cells” and “Erythrocytes”.
But for Q1, they want the 4 MAIN COMPONENTS — which are:
→ Red Blood Cells
→ White Blood Cells
→ Platelets
→ Plasma
Yes.
---
2. All blood cells are produced in the ________________.
This is a fact: Blood cells are made in the Bone Marrow.
✔ Answer: Bone Marrow
---
3. ________________ helps carry oxygen and remove carbon dioxide.
That’s the job of Red Blood Cells — specifically because they contain hemoglobin.
But the blank is asking for what *helps* carry oxygen — so either “Red Blood Cells” or “Hemoglobin”. Let’s see context.
Later, Q13 asks about the protein that attaches to oxygen — that’s hemoglobin.
So here, Q3 is probably referring to the cell type: Red Blood Cells
✔ Answer: Red Blood Cells
---
4. ________________ is a light yellow fluid that carries nutrients to all parts of the body.
That’s describing Plasma — the liquid part of blood.
✔ Answer: Plasma
---
5. ________________ Help fight infections and diseases.
That’s the job of White Blood Cells
✔ Answer: White Blood Cells
---
6. Red blood cells are also called ________________.
Scientific name: Erythrocytes
✔ Answer: Erythrocytes
---
7. ________________ help with blood clotting.
That’s Platelets (also called thrombocytes)
✔ Answer: Platelets
---
8. White blood cells are also called ________________.
Scientific name: Leukocytes
✔ Answer: Leukocytes
---
9. Platelets are also called ________________.
Scientific name: Thrombocytes
✔ Answer: Thrombocytes
---
10. Red blood cells live up to ________________ months.
Standard biology fact: RBCs live about 4 months (or 120 days).
✔ Answer: 4
---
11. There are ________________ components of blood.
We said earlier: 4 main components — RBCs, WBCs, Platelets, Plasma.
✔ Answer: 4
---
12. ________________ are the biggest of all the blood cells.
White Blood Cells are larger than Red Blood Cells and Platelets.
✔ Answer: White Blood Cells
---
13. Red blood cells have a protein that attaches itself to oxygen molecules and it is called ________________.
That’s Hemoglobin
✔ Answer: Hemoglobin
---
14. Plasma is mostly made up of ________________.
Plasma is about 90% water.
✔ Answer: Water
---
15. These are small flat, shaped like a doughnut without a hole ________________.
Description matches Red Blood Cells — they’re biconcave discs, often described as “doughnut-shaped without a hole”.
✔ Answer: Red Blood Cells
---
Now let’s double-check any tricky ones:
Q1: Main components — yes, 4: RBC, WBC, Platelets, Plasma → correct.
Q3: Could someone argue “Hemoglobin”? But the sentence says “helps carry oxygen” — RBCs do the carrying; hemoglobin is inside them doing the binding. Since Q13 specifically asks for the protein, Q3 should be RBCs.
Q15: “shaped like a doughnut without a hole” — definitely RBCs.
All answers match standard middle/high school biology.
---
Final Answer:
1. Red Blood Cells, White Blood Cells, Platelets, Plasma
2. Bone Marrow
3. Red Blood Cells
4. Plasma
5. White Blood Cells
6. Erythrocytes
7. Platelets
8. Leukocytes
9. Thrombocytes
10. 4
11. 4
12. White Blood Cells
13. Hemoglobin
14. Water
15. Red Blood Cells
Parent Tip: Review the logic above to help your child master the concept of components of blood worksheet.
