Across
- 2. nerve branches that speed up heart rate
- 4. relaxation
- 7. largest artery in the body
- 10. contraction
- 11. weight of the heart in comparison to the horses overall weight
Down
- 1. small fragments of cells
- 3. pump blood away from the heart
- 5. nerve branches that slow heart rate
- 6. how veins stop blood flowing down
- 8. how many chambers in the heart
- 9. type of circulatory system where blood gets passed through body twice