T HE VERTEBRATE BODY 329 



REVIEW QUESTIONS 



1. Why is it more difficult to pick a type animal for the chordates than for 

 other phyla that we have studied? 



2. What are the functions of the skeletal system? 



3. Name the structures found at a movable joint and give the function of each. 



4. What is a suture ? 



5. What structure in man is homologous to the urostyle of the frog? 



6. What is the one specialized function of muscle cells ? 



7. Name the three kinds of muscles, tell where each kind is found, and give the 

 histological features that distinguish each. 



8. What is meant by the origin, insertion, and action of a muscle ? 



9. Explain how the brain regulates the degree of pull exerted by muscles so 

 that a person can pick up a book, hold it for reading, and gently lay it down on a table. 



10. How does heart muscle differ physiologically from the other types of muscles? 



11. Distinguish between sensory and motor nerves. 



12. What part of the nervous system regulates the involuntary body reactions? 



13. List the sense organs of the frog and the human body and tell how each 

 functions. 



14. Compare the location of the common chemical sense in the frog and in man. 



15. What parts of the human brain are proportionally larger than corresponding 

 parts in the frog ? 



16. What are the four kinds of taste? 



17. Name the five regions of the brain. 



18. What parts of the brain are in the forebrain, midbrain, and hindbrain? 



19. Explain how nerves control the rate of heart beat. 



20. How can we prove that the neuromuscular junction becomes fatigued before 

 the muscle becomes fatigued? 



21. What is a motor unit? 



22. Explain the all or none law. 



