Directions: Read the questions carefully choose the correct answer.             

___1. An organ that protects the lungs and the heart.

2. Muscles that make up the heart.

3.What is digestive system?

4. It is a hollow muscular organ located in the chest between the lungs  which is about the sized of our clenched fist.

5.What is the primary function of the respiratory system?

6. What human body system is responsible for the distribution of food nutrients and oxygen throughout the body?

7. It is the largest gland in the body and is located near the stomach and produces bile.

8. Most of the digestion takes place here in this part of the digestive system. 

9. The following are the functions of musculoskeletal system in the body, except ONE.

10. How do  bones in the chest and skull work in our body?

11. What system is responsible for the exchange of carbon dioxide between the atmosphere and between the blood and the body cells.

12. Which of these is the work of the respiratory system?

13. Which of the following is a skeletal muscle?

14. Which activity is made possible by smooth muscle?

15. What happens to the muscles when they are not often used?

16. Which of the following bones protect the brain?

17. There is an oil-like fluid at the nd of the bones which is called __________

18. How many bones does a baby has?

19. It is formed when two bones connect where you can do a lot of movements because of this..

20. It is the pigment that determines the color of the skin which function is to protect the skin by absorbing the ultraviolet rays from the sun.