Across
- 3. A measure of the speed of heart beats (5,4)
- 6. Type of respiration carried out without oxygen (9)
- 7. Tiny air sacs where gas is exchanged in the lungs (7)
- 9. A chemical reaction between glucose and oxygen to release energy in cells (11)
- 10. A time when plants respire only (5)
- 12. The feeling of a heart beat (5)
- 13. A simple sugar (7)
- 14. Muscular sheet which contracts to inhale (9)
Down
- 1. Type of respiration with an excess of oxygen (7)
- 2. Tubes leading from the trachea to each lung (7)
- 3. Organ which pumps blood around the body (5)
- 4. The tube carrying air to the lungs (7)
- 5. Activity which raises your heart rate (8)
- 8. Organ responsible to gas exchange with the blood (4)
- 10. A second organ used to breath and smell (4)
- 11. The part of red blood cells which binds to oxygen (11)