Across
- 2. Blood goes to this organ to obtain oxygen
- 6. What nutrients is needed for respiration?
- 7. Name the system which contains the heart and the blood
- 8. Exercise ______ the heart rate.
- 11. What carries oxygen around the body?
- 12. What colour blood?
Down
- 1. Respiration releases ______
- 3. How many times does the heart pump blood around the body?
- 4. This blood vessel carries blood back to the heart
- 5. How many chambers does the heart contain?
- 9. dioxide we breath this gas out as a product of respiration
- 10. This blood vessel blood away from the heart
- 11. What is the unit for heart rate?