During relaxation of the left atrium blood enters this chamber through the

During relaxation of the left atrium blood enters

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11. During relaxation of the left atrium, blood enters this chamber through thepulmonary veins .The correct answer is thepulmonary veins. 12. An average heartbeat, or cardiac cycle, lasts approximately: a. 8.0 secondsb. 80 secondsc. 0.80 secondsd. 0.008 secondse. 60 seconds Correct! The answer is c. The average cardiac cycle lasts 0.80 seconds! 13. During Phase 2 of the cardiac cycle, which of the following events are occurring? semilunar valves are open.
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ventricle into the aorta. Sorry. The answer is e. During Phase 2 of the cardiac cycle, the atria relax (diastole) while the ventricles contract (systole). The AV valves are closed while the semilunar valves are open, so blood moves from the right ventricle into the pulmonary trunk, and from the left ventricle into the aorta. 14. Theis the heart component with the fastest rate of spontaneous depolarization and acts as the heart's pacemaker. 15. The P wave of the ECG represents: Correct! The answer is b. The P wave of the ECG represents atrial depolarization, which results in atrial systole. 16. During Phase 1 of the cardiac cycle, which of the following events are occurring? semilunar valves are open. semilunar valves are closed. closed. veins. Sorry. The correct answer is b. During Phase 1 of the cardiac cycle, the atria contract, while the ventricles relax; AV valves are open while the semilunar valves are closed. 17. During Phase 3 of the cardiac cycle, which of the following events are occurring? a. Atria relax (diastole) while the ventricles contract (systole); AV valves are closed while the b. Atria contract (systole) while the ventricles relax (diastole); AV valves are open while the c. Atria and ventricles are relaxed (diastole); AV valves are open while the semilunar valves are d. Blood enters the right atrium through the venae cavae and the left atrium through the pulmonary e. Both c and d are correct. semilunar valves are open. semilunar valves are closed. closed. veins. Correct! The correct answer is e. Both c and d are correct. 18. Once action potentials are generated by the heart's intrinsic conduction system, they are conducted from myocardial cell to myocardial cell via ___________________ located in the _____________.
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Sorry. The answer is b. The P wave of the ECG represents atrial depolarization, which results in atrial systole.
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  • Spring '13
  • left ventricle, left atrium, b. atria, a. atria, c. Atria

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