Across
- 2. a tiny blood vessel that connects an artery to a vein and that exchanges substances such as gases and nutrients between the blood and the body cells.
- 8. a muscular organ that pumps blood throughout the body.
- 9. A pair of tubes that branch off the trachea and enter the lungs.
- 11. a cell fragment that helps to form blood clots and stop bleeding
- 12. respiration The process in which oxygen is combined with food (glucose) to release energy.
- 13. The respiratory system is the system of organs and tissues that work together to help you breathe.
- 14. The tube that transports air from the throat to the lungs, also called the windpipe.
- 16. Elastic, sponge-like organs in the chest that are the main organs of the respiratory system.
Down
- 1. the cells of the circulatory system that fight disease by attacking invading microorganisms and making antibodies to fight infection.
- 3. a blood cell that carries oxygen to the cells of the body and carries carbon dioxide from cells back to the lungs.
- 4. system A transport system that uses blood to carry nutrients and oxygen to the cells of the body.
- 5. A sheet-like muscle beneath the lungs that expands and contracts the chest cavity to control breathing.
- 6. A blood vessel that carries blood away from the heart.
- 7. Either lower chamber of the heart.
- 10. A blood vessel that carries blood toward the heart.
- 15. Either upper chamber of the heart.