2. Where are the muscles in your arms, which help you to move your elbows?
3. Show why joints must have muscles.
4. What do we call the muscles of the lower animals?
5. What fasten the muscles to the bones?
6. Why do chickens and turkeys need strong muscles in their legs?
7. Why do swallows need strong breast muscles?
8. What makes the muscles of the blacksmith's arm so strong?
9. What will make your muscles strong?
10. What will make them weak?
11. What does alcohol often do to the muscles?