Across
- 3. circuit with body minus lungs
- 4. what separates the sides of the heart
- 6. inner layer of heart
- 8. loose fitting sac around heart
- 11. circuit with just the lungs
Down
- 1. the heart is a __ pump
- 2. pump blood out of heart
- 5. heart's surface
- 7. receive blood from veins
- 9. middle layer of muscle in heart
- 10. number of valves in human heart