Across
- 1. The process of releasing energy from glucose in cells. (11)
- 3. The sugar broken down in respiration to release energy. (7)
- 5. The muscle that helps with breathing by contracting and relaxing. (9)
- 7. A structure in the heart that prevents backflow of blood. (5)
- 9. Tiny air sacs in the lungs where gas exchange occurs. (7)
- 10. A blood vessel that carries blood away from the heart. (6)
- 11. The lower chamber of the heart. (9)
- 12. The process of burning something to release energy. (10)
Down
- 2. Gas required for both burning food and respiration. (6)
- 4. a unit used to measure energy in food. (7)
- 6. The rhythmic throbbing of arteries caused by the beating of the heart. (5)
- 8. The element found in all food that is released as dioxide during respiration. (6)
- 10. The upper chamber of the heart. (6)
- 11. A blood vessel that carries blood toward the heart. (4)