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Across 4. Neutralizing of the polarity of a cardiac cell by an inflow of sodium ions. _________ results, in contraction of the cardiac cells and renders it incapable of further contraction until repolarization. 6. The ability of cardiac muscles to generate impulses. 8. The volume of blood in the ventricles at the end of diastole. 10. A faster-than-normal heart rate. 11. Change in the size, shape, structure, and physiology of the heart due to damage to the myocardium. 12. Affecting the force of cardiac muscle contraction. 13. A variation from the normal rhythm. AKA dysrhythmia. 14. The resistance (pressure) in arteries that must be overcome to empty blood from the ventricle. 15. Affecting the heart rate.

Down 1. The return of the cell membrane to its resting polarity after depolarization. 2. Contraction of the ventricles without a corresponding contraction of the atria. _________ arise from an irritable focus or foci in the ventricles. 3. The amount of blood ejected by the left ventricle with each beat. 5. Bradycardia associated with an irregularity of heart rhythm. 7. A slower-than-normal heart rate. 9. Tachycardia associated with an irregularity in normal hearth rhythm.