6. In a normal electrocardiogram, the A. P wave results from repolarization of t

Question

6. In a normal electrocardiogram, the A. P wave results from repolarization of the atria. B. QRS complex results from ventricular depolarization. C. P wave occurs after the QRS complex but before the T wave. D. T wave represents depolarization of the atria. E. repolarization of the atria is clearly visible. 7. In the cardiac cycle, A. the right atrium and the right ventricle contract simultaneously. B. the two atria relax while the two ventricles contract. C. the left atrium contracts before the right atrium. D. all four chambers of the heart contract at the same time. E. all four chambers of the heart are in systole at the same time. 8. Blood does not enter or leave the ventricles during the period called A. ejection. B. rapid filling. C. atrial systole. D. isovolumic contraction. E. active and passive filling. 9. Blood does not enter or leave the ventricles during the period called A. ejection. B. rapid filling. C. atrial systole. D. isovolumic contraction. E. active and passive filling. 10. Stimulation of the heart via the sympathetic nerves would A. decrease heart rate. B. decrease stroke volume. C. increase the force of ventricular contraction. D. increase end-systolic volume. E. not affect heart rate and force of contraction.

Explanation / Answer

6. QRS complex results from ventricular depolarization

7. Two atria relax while two ventricle contract

8. Isovolumic contraction

9. Isovolumic contraction (question is repeated)

10. Increase force of ventricular contraction

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