Reading Comprehension Passages with Questions - 6th Grade - Free Printable

Since I can't view or access images directly, I can’t see the specific content of the image you uploaded. However, based on your description, it appears to be a biology worksheet titled "It Circulates" from a "Circulatory System: Life Science" activity, which includes questions about the human circulatory system.

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Questions and Answers

#### 1) What is the function of the white blood cells?
✔ Answer: White blood cells (leukocytes) are part of the immune system. Their main function is to protect the body against infections and foreign substances. They do this by:
- Engulfing pathogens (phagocytosis),
- Producing antibodies,
- Activating other immune cells.

They are crucial for fighting off bacteria, viruses, and other invaders.

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#### 2) How are arteries and veins alike?
✔ Answer: Arteries and veins are alike because:
- Both are blood vessels that transport blood throughout the body.
- Both have three layers: tunica intima (inner), tunica media (middle), and tunica externa (outer).
- Both carry blood away from or toward the heart (arteries carry blood *from* the heart; veins carry blood *to* the heart).

> Note: The key difference is that arteries usually carry oxygenated blood (except pulmonary arteries), while veins carry deoxygenated blood (except pulmonary veins).

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#### 3) Based on other information in the passage, what gases are being exchanged in the alveoli?
✔ Answer: In the alveoli (tiny air sacs in the lungs), oxygen (O₂) and carbon dioxide (CO₂) are exchanged:
- Oxygen moves from the alveoli into the bloodstream (to be delivered to cells).
- Carbon dioxide moves from the blood into the alveoli (to be exhaled).

This process is called gas exchange and occurs via diffusion.

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#### 4) What is the main idea of this passage?
✔ Answer: The main idea is that the circulatory system transports essential substances like oxygen, nutrients, and waste products throughout the body using blood and blood vessels. It emphasizes how blood components (red blood cells, white blood cells, platelets) perform specific functions, and how the system works with the respiratory system (e.g., gas exchange in alveoli).

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#### 5) What does hemoglobin do?
✔ Answer: Hemoglobin is a protein found in red blood cells. Its main function is to:
- Bind oxygen in the lungs and carry it to tissues throughout the body.
- Also helps transport carbon dioxide from tissues back to the lungs for exhalation.

Hemoglobin gives blood its red color when oxygenated.

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Summary Table

| Question | Answer |
|--------|--------|
| 1 | White blood cells fight infection and protect the body. |
| 2 | Both are blood vessels with three layers; both transport blood. |
| 3 | Oxygen and carbon dioxide are exchanged in the alveoli. |
| 4 | The circulatory system transports substances using blood and vessels. |
| 5 | Hemoglobin carries oxygen and carbon dioxide in red blood cells. |

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