Human Circulatory System - Worksheet | Distance Learning ... - Free Printable

Let's go through Question 4 and Question 5 step by step.

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Q.4: True or False

1. In red blood cells, oxygen molecules bind to a protein called hemoglobin.
✔ True (T)
*Explanation:* Hemoglobin is the iron-containing protein in red blood cells that binds oxygen in the lungs and transports it to tissues throughout the body.

2. Arteries usually carry oxygenated blood and veins usually carry deoxygenated blood.
✘ False (F)
*Explanation:* This is generally true for systemic circulation, but not always. For example, pulmonary arteries carry deoxygenated blood from the heart to the lungs, and pulmonary veins carry oxygenated blood from the lungs back to the heart. So the rule doesn't apply universally.

3. About 55% of blood is made up of plasma, a clear pale-yellow fluid.
✔ True (T)
*Explanation:* Blood consists of about 55% plasma and 45% formed elements (red blood cells, white blood cells, platelets). Plasma is indeed a pale yellow fluid.

4. The systemic circulation carries deoxygenated blood from the heart to the lungs.
✘ False (F)
*Explanation:* The systemic circulation carries oxygenated blood from the heart to the body and returns deoxygenated blood back to the heart. The pulmonary circulation carries deoxygenated blood from the heart to the lungs.

5. The pulmonary circulation carries oxygenated blood to the body.
✘ False (F)
*Explanation:* The pulmonary circulation carries deoxygenated blood from the heart to the lungs and returns oxygenated blood back to the heart. It does not carry blood to the body — that’s the role of the systemic circulation.

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✔ Final Answers for Q.4:

1. T
2. F
3. T
4. F
5. F

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Q.5: Label the chambers of the human heart on the diagram below

Since I can’t see the image directly, I’ll describe how to label the chambers based on standard anatomy.

Typically, a human heart diagram shows:

- Top left chamber: Left Atrium
- Bottom left chamber: Left Ventricle
- Top right chamber: Right Atrium
- Bottom right chamber: Right Ventricle

Key features:
- Pulmonary veins (blue) → enter Left Atrium (carry oxygenated blood from lungs)
- Aorta (red) → exits Left Ventricle (carries oxygenated blood to body)
- Superior & Inferior vena cava (blue) → enter Right Atrium (carry deoxygenated blood from body)
- Pulmonary arteries (red) → exit Right Ventricle (carry deoxygenated blood to lungs)

So, assuming the diagram has four boxes pointing to the chambers:

From top-left to bottom-right (standard orientation):

- Top left box → Left Atrium
- Top right box → Right Atrium
- Bottom left box → Left Ventricle
- Bottom right box → Right Ventricle

> 💡 Tip: Remember:
> - "Atria" are the upper chambers (receive blood).
> - "Ventricles" are the lower chambers (pump blood).
> - Right side handles deoxygenated blood; left side handles oxygenated blood.

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✔ Final Answer for Q.5 (Labeling):

Assuming the diagram has four labeled boxes:

- Top left: Left Atrium
- Top right: Right Atrium
- Bottom left: Left Ventricle
- Bottom right: Right Ventricle

*(Note: If the diagram has arrows or different positioning, adjust accordingly, but this is the standard layout.)*

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Let me know if you'd like a visual description or help with a specific version of the diagram!