Across
- 1. The hard white layer surrounding the heart
- 3. The liquid that's pumped by the heart.
- 5. The best instrument to cut through chunks of tissue
- 7. Part of the heart that close to stop blood flowing the wrong way.
- 8. Blood vessels that bring blood back to the heart
- 9. The purple soft areas of the heart
Down
- 2. The string-like threads inside the heart.
- 4. Blood vessels that carry blood away from the heart.
- 6. Very sharp knife like instrument