58 This figure shows the events ofthe cardiac cycle What doe

58. This figure shows the events ofthe cardiac cycle. What does 4 represent? A. aortic valve opening B. aortic valve closing C. AV valve opening D. AV valve closing E. both aortic and AV valves opening 59. This figure shows the events of the cardiac cycle. At 0.2 sec in the graph A. the aortic valve is open B. the AV valve is open C. the ventricles have reached end-diastolic volume D. the ventricles are in the isovolumetric phase E. the ventricles are in systole

Solution

60. B. can cause systemic edema

61. A. a. SV=30 mL/beat, HR=80 bpm.

62. c. Increased venous return.

63. E.  The cardiac output.

64. d. Medulla oblongata; chemoreceptors in the aortic arch.

65. b. The end-diastolic volume.