Across
- 3. to send air out of your lungs; breathe out
- 4. connected with the heart
- 6. either of the two upper spaces in the heart
- 7. the two main branches of the trachea leading to the lungs
- 9. either of the two lower spaces in the heart that pump blood to the lungs
- 10. a structure in the heart or in a vein that lets blood flow in one direction only
- 11. a complicated system of tubes that cross each other and are connected to each other
- 13. the regular beating of the heart, especially when it is felt at the wrist or side of the neck
- 16. to be made or formed from several parts
- 17. the way a person or thing moves or points towards
- 18. the act of giving something and then something else is given back
- 20. to be filled with energy, power
- 22. the pale yellow liquid that forms 55% of human blood and contains the blood cells
- 24. any of the tubes through which blood flows through the body
- 25. materials that are no loner needed
Down
- 1. a very small cell in the blood that makes it thicker and more solid in order to stop bleeding caused by an injury
- 2. any of the smallest tubes in the body that connect the arteries and veins
- 5. one of the four spaces in the heart
- 8. the tubes that carry blood from the heart to other parts of the body
- 9. any of the tubes that carry blood from all parts of the body towards the heart
- 12. to produce a strong, regular beat
- 14. the area at the top of the throat that contains the vocal cords
- 15. needing careful treatment, especially because easily damaged
- 19. tiny thin walled, capillary rich sacs in the lungs where the exchange of oxygen and carbon dioxide take place
- 21. substances that flow and are not solid
- 23. an almost solid piece of something