38. which of the following is true concerning the systolic phase of the cardiac

Question

38. which of the following is true concerning the systolic phase of the cardiac cycle? 39. which of the following is true concerning diastole?

38. Which of the following is true concerning the Systolic Phase of the cardiac cycle? A. All cardiac valves are open during systole. B. For only a very short period of time, just before the aortic valve opens, andjust before the AV-valves re-open) all cardiac valves are closed, during systole All cardiac valves are never either closed nor open during systole The aortic valve closes just before the AV-valve closes; andthe pulmonary arterial valve closes just before the AV-valve closes. None of the above is correct. C. D. E. 39. Which of the following is true concerning Diastole? A. In the normal 'resting cardiac cycle, Systole takes much more time than Diastole. B. Increasing heart rate increases the time spent within Diastole. C. All cardiac valves are closed during Diastole. D. Diastole is essential to cardiac function because Diastole is also known as the "period of filling". None of the above is correct. E. HEI p IMPROVE OFFICE

Explanation / Answer

38. During systole

C. Is correct.

All cardiac valves never either open nor closed during systole.

39. D. Is correct.

Diastole is essential to cardiac function because diastole is also known as the period of filling.

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