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5. a device that uses lenses to make very small objects look larger
6. a tube that carries blood to the heart from the other parts of the body
11. protected against a particular disease by particular substances in the blood
14. to pass a disease to a person, animal, or plant
15. an extremely small piece of organic material that causes disease
18. one of the thick tubes that carry blood from the heart to other parts of the body
19. the smallest basic unit of a plant or animal
20. a very thin tube, especially one of the smaller tubes that carry blood around the body

1. the muscle that separates the chest from the lower part of the body
2. illness of people
3. to cause a person, animal, or part of the body to lose the ability to move or feel
4. either of the two organs in the chest with which people and some animals breathe
7. a common infectious illness that causes fever and headache
8. the regular beating of the heart
9. very small organisms that are found everywhere and are the cause of many diseases
10. the organ in your chest that sends the blood around your body
12. a thick liquid produced inside the nose
13. a set of connected things or devices that operate together
16. the tube that carries air from your throat to your lungs
17. he red liquid that is sent around the body by the heart