Body Systems

Lessons 1-7

1. What structures make up the gas exchange system in humans?

2. How does air, containing oxygen, get into and out of our lungs?

3. Where does oxygen get into the blood?

4. What structures make up the human circulatory system?

5. Are the lungs and heart of a sheep similar to those of a human?

6. How are messages sent around the body?

7. How does the body get rid of wastes?

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