Respiration and Circulation

2. combined, these structures have the surface area of a tennis court
3. the gas exchange organ of fish
4. this structure prevents oxygenated and deoxygenated blood from mixing within the heart
5. the energy currency of the body
9. This term describes the amount of a gas required to remove accumulated lactic acid from cells. (6,4)
13. chamber of the heart that pumps blood away from the body
16. respiration that results in lactic acid production
17. these cell fragments are important for blood clotting
18. allows entry and exit of air in insects
20. respiration that uses oxygen
21. these blood vessels typically carry oxygenated blood
24. describes blood flowing around the body

1. the term describing the movement of oxygen and carbon dioxide into and out of the blood. (3,8)
4. this liquid helps gases to more easily diffuse into the blood
6. activity that can help to improve lung and heart function
7. part of a red blood cell that binds oxygen
8. these blood vessels have walls that are only one cell thick
10. in science, this word is typically associated with the lungs
11. body part made of many cells of different types that all work together
12. chamber of the heart where blood enters the heart
14. food group that contributes to heart disease
15. body part made of many cells of the same type
19. the colour of the liquid component of blood
22. the main airway leading towards the lungs
23. these blood vessels have valves to prevent backflow