Across
- 3. The circulatory system is made up of the heart, blood and blood _____.
- 5. During exercise, the heart rate _____.
- 6. Process where energy is released.
- 8. _____ substances are transported to different parts to be removed.
Down
- 1. The human circulatory system is also a _____ system.
- 2. One heartbeat is one contraction and _____ of the heart.
- 4. _____ food is transported to all parts of the body.
- 7. Blood flowing from the body to the heart is oxygen-_____.