You have learned already what alcohol will do to muscles and nerves, so you are ready to answer for stomach, for heart, and for lungs. Is alcohol a help to them?

REVIEW QUESTIONS.

1. Besides carrying food all over the body, what other work does the blood do?

2. Why does the blood in the veins look blue?

3. Where is the blood made pure and red again?

4. Where is it sent, from the lungs?

5. What must the lungs have in order to do this work?

6. When do the lungs rest?

7. Why should we not wear tight clothes?

8. How does the air in a room become spoiled?