382 A YEAR IK SCIENCE 



4. Describe a typical muscle. 



5. What is the appearance of muscle as seen on the 

 cut end of a piece of meat? 



6. What are tendons? What is their use? 



7. How are muscles made to act? 



8. Explain fully how the arm is flexed and ex- 

 tended by the action of the biceps and triceps muscles. 



9. What is meant by the term voluntary, muscle? 

 Involuntary muscle? 



10. Name two voluntary muscles and also two invol- 

 untary ones. 



11. What is probably the cause of fatigue? 



12. Explain how and why the muscles should be 

 exercised. 



13. Why are games a beneficial form of exercise 1 / 



