2. The heart is located in the (a)   .

3. Blood travels to all parts of the body through the (a)   .

4. (a)   allows us to breath.

5 Air is a mix of gases, mainly consist of (a)   .

6. A (a)   is an elastic tissue.

7. They have the ability to contract and (a)   .

8. (a)   air enters the lungs through the nose.

9. (a)   : To push air out.

10. The (a)   is part of the digestive system.

11. Food is swallowed and goes down the (a)   .

12. Waste goes to the (a)   .

13. Food enters through the (a)   to the digestive system.

14. The (a)   supports and gives shapes to the body.

15. It’s a group of (a)   connected by joints.