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3. a very thin tube, especially one of the smaller tubes that carry blood around the body
4. the person who has the highest political position in a country
5. an area designed for children to play in outside
9. to cause a person, animal, or part of the body to lose the ability to move or feel
12. a common infectious illness that causes fever and headache
13. the organ in your chest that sends the blood around your body
16. a thick liquid produced inside the nose
18. someone who helps someone else to do a job
21. a set of connected things or devices that operate together
24. the regular beating of the heart
25. illness of people
26. a person who does something willingly and without being forced or paid to do
27. an event, sometimes lasting a few days, at which there is a group of talks on a particular subject

1. one of the thick tubes that carry blood from the heart to other parts of the body
2. very small organisms that are found everywhere and are the cause of many diseases
6. the muscle that separates the chest from the lower part of the body
7. a person who is elected or chosen to lead the group who governs a town or city
8. a tube that carries blood to the heart from the other parts of the body
10. the tube that carries air from your throat to your lungs
11. a device that uses lenses to make very small objects look larger
14. a person who is a member of a particular country
15. either of the two organs in the chest with which people and some animals breathe
17. to pass a disease to a person, animal, or plant
19. protected against a particular disease by particular substances in the blood
20. he red liquid that is sent around the body by the heart
22. an extremely small piece of organic material that causes disease
23. the smallest basic unit of a plant or animal
28. the set of necessary tools