Across
- 4. the smaller chambers located at the top of the heart
- 8. name of the right atrioventricular valve
- 10. the active phase of the cardiac cycle
- 11. the middle and thickest layer of the heart
- 12. name of the left atrioventricular valve
- 13. the name for a relatively slow heart rate
Down
- 1. the larger chambers located at the bottom of the heart
- 2. the sac which encloses the heart
- 3. the resting phase of the cardiac cycle
- 5. the name for a relatively high heart rate
- 6. serous membrane that forms the outermost layer of the heart
- 7. name of the semilunar valve that leads to the lungs
- 9. name of the semilunar valve that leads to the aorta
