health and food

1. a living creature
5. the organs in the body which protect us from illnesses
8. causes somebody to become sick after eating specific food
12. to make somebody well again
13. a small tube that carries blood to different parts of the body
14. to move air into and out of the lungs
17. to become worse because of being badly affected by something
18. the ability to hold a number of things
19. self-confidence
20. to suddenly force air out through your nose and mouth with a loud noise because of a cold
21. a piece of paper you are given after paying for goods

2. a change in the body which shows that a disease is present
3. absolutely necessary for something
4. a body tissue that contract and produce movement
6. the condition of not being able to sleep
7. helpful effect
9. to become larger and taller as time passes
10. to cure a patient of a disease
11. the process in which a doctor cuts into somebodys body in order to remove a diseased part
15. food containing a lot of nutritious substances
16. to become thinner