Across
- 3. - Relating to the heart.
- 5. - The natural electrical system that regulates the heart rate.
- 7. - Upper chamber of the heart.
- 8. - Lower chamber of the heart.
Down
- 1. - The largest artery in the human body.
- 2. - Blood vessel that carries blood away from the heart.
- 3. - A section of the heart that receives or pumps blood.
- 4. - Relating to the blood vessels that supply the heart muscle.
- 5. - Pertaining to the lungs or the blood vessels to and from the lungs.
- 6. - Structure that ensures one-way blood flow within the heart.