Across
- 4. The great exchange of gas happens in the
- 6. The human heart is divided by the
- 9. Protective sac surrounding the heart
- 10. Carries blood back to the heart
Down
- 1. Arteries carry blood that is rich in
- 2. One way doors of the heart
- 3. Blood travels away from the heart in the
- 5. The largest artery of the human heart
- 6. The human heart feels
- 7. The color of blood leaving the human heart
- 8. The human heart is the size of a