Across
- 2. NODE – The natural pacemaker of the heart.
- 7. – The middle layer of a blood vessel wall.
- 9. – The outermost covering of the heart.
- 10. – The largest artery in the human body.
Down
- 1. – A small vessel that collects blood from capillaries and joins veins.
- 3. – Valve that opens from the left ventricle into the major artery.
- 4. – The upper chambers of the heart.
- 5. – Valve between the left atrium and left ventricle.
- 6. – Arteries that supply blood to the heart muscle.
- 8. – The wall dividing the left and right sides of the heart.