Across
- 4. Stimulates the contraction of both atria.
- 5. Is the total volume of blood ejected from the heart per minute
- 9. Is also affected by the endocrine and nervous
- 10. Between 60 and 80 ml of blood are ejected from the ventricles.
- 12. Another conducting cell group located between the atria and ventricle.
- 15. Make a sound when they close during the cardiac cycle.
Down
- 1. Spreads out over the atria, making them contract or depolarize.
- 2. Electrical impulse shoots along the ventricles
- 3. Generates in the heart muscle itself.
- 6. A heart removed from the body will continue to beat
- 7. Are closed to prevent the blood flowing back into the ventricles.
- 8. Contracts rhythmically to perform its duty as a forceful pump.
- 11. Increases cardiac output, because the heart rate is increased.
- 13. The valves that make a sound when they close.
- 14. The muscles receive only 27% of the cardiac output.