Crosswords Puzzle

Horizontal Words

1. Prevents the backflow of blood as it is pumped from the left atrium to the left (12)
3. A section of nodal tissue that sets the rate of contraction for (15)
5. The inner layer of the heart (11)
7. The outer layer of the wall of the heart. (10)
9. The largest artery in the body, of which most major arteries branch off from. (5)

Vertical Words

2. The ventricles contract and pump blood to the arteries. (13)
4. Fiber branches that extend from the atrioventricular bundle. (15)
6. The muscular middle layer of the wall of the heart (10)
8. The heart ventricles are relaxed and the heart fills with blood. (14)
10. Supply oxygenated blood to the arms. (10)