Types of Blood Vessels worksheet - Free Printable

Let's solve each question based on the knowledge of the types of blood vessels — arteries, veins, and capillaries. The diagram shows how blood flows from an artery → capillaries → vein, which helps us understand their functions.

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1. What blood vessel with thick muscular wall and narrow lumen takes Away the blood from the heart?

✔ Answer: Arteries

- Arteries carry blood away from the heart.
- They have thick muscular walls to withstand high pressure.
- Their lumen is relatively narrow compared to veins.

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2. The arteries have valves. _________

✘ Answer: False

- Arteries do not have valves.
- Valves are found in veins to prevent backflow.
- Arteries rely on the pressure from the heart to push blood forward.

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3. The largest artery is the _____________.

✔ Answer: Aorta

- The aorta is the largest artery in the body.
- It branches off from the left ventricle of the heart and carries oxygenated blood to the rest of the body.

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4. The artery carries _________ blood to all the different parts of the body.

✔ Answer: Oxygenated (or oxygen-rich)

- Except for the pulmonary artery, most arteries carry oxygenated blood.
- The pulmonary artery carries deoxygenated blood to the lungs.
- But generally, when we say "the artery", we mean systemic arteries that carry oxygenated blood.

> Note: This question assumes general systemic circulation.

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5. What blood vessel with thin muscular walls and large lumen takes blood Towards the heart?

✔ Answer: Veins

- Veins carry blood toward the heart.
- They have thin muscular walls and a large lumen (to hold more blood at low pressure).
- Blood pressure in veins is much lower than in arteries.

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6. Veins have valves to prevent back flow. _________

✔ Answer: True

- Yes, veins have one-way valves to prevent backflow of blood.
- Especially important in limbs where blood must travel upward against gravity.

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7. The largest vein is the _____________.

✔ Answer: Vena cava

- There are two venae cavae: superior and inferior.
- They return deoxygenated blood from the body to the right atrium of the heart.
- The inferior vena cava is the largest vein in the body.

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8. The smallest blood vessel is ____________. It has one cell thick walls and very small lumen.

✔ Answer: Capillary

- Capillaries are the smallest blood vessels.
- Their walls are one cell thick (endothelial cells), allowing efficient exchange.
- Very small lumen — only one red blood cell can pass through at a time.

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9. Capillaries carry blood at _________ pressure.

✔ Answer: Low pressure

- Blood pressure drops significantly by the time it reaches capillaries.
- This low pressure prevents damage to delicate capillary walls while still allowing diffusion.

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10. The blood vessel where gases, nutrients and wastes are exchanged. _________

✔ Answer: Capillaries

- Exchange of oxygen, CO₂, nutrients, and waste products occurs across capillary walls.
- Due to their thin walls and large surface area, they are ideal for diffusion.

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11. The walls of the capillaries are _________ to allow easy diffusion of gases, nutrients and wastes.

✔ Answer: Thin / One-cell thick

- The capillary walls are very thin (only one cell thick), allowing rapid diffusion.
- This enables efficient exchange between blood and tissues.

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✔ Final Answers:

| Question | Answer |
|--------|--------|
| 1 | Arteries |
| 2 | False |
| 3 | Aorta |
| 4 | Oxygenated |
| 5 | Veins |
| 6 | True |
| 7 | Vena cava |
| 8 | Capillary |
| 9 | Low pressure |
| 10 | Capillaries |
| 11 | Thin (or one-cell thick) |

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📝 Summary of Key Points:

- Arteries: Thick walls, carry blood away from heart, no valves, high pressure.
- Veins: Thin walls, carry blood toward heart, have valves, low pressure.
- Capillaries: Tiny, thin-walled, site of exchange, low pressure.

This worksheet teaches basic circulatory system anatomy and function — essential for understanding human physiology!