The second heart sound [dub] is associated with simultaneous closure of:

1. Right AV and pulmonary semilunar valve
2. Left AV and aortic semilunar valve
3. Right and left AV valves
4. Right and left semilunar valves
Subtopic:  Human Heart: Cardiac Cycle |
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The first heart sound is heard during:

1. beginning of ventricular systole
2. end of ventricular systole
3. atrial systole
4. ventricular ejection
Subtopic:  Human Heart: Cardiac Cycle |
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Cardiac output is defined as
1. blood pressure X stroke volume.
2. peripheral resistance X heart rate.
3. heart rate X stroke volume.
4. Systolic pressure – diastolic pressure.

Subtopic:  Human Heart: Cardiac Cycle |
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What is the percentage of atrial blood that flows into the ventricles without atrial systole?

1. 90 2. 70
3. 50 4. 30
Subtopic:  Human Heart: Cardiac Cycle |
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During a cardiac cycle, the ventricular systole will lead to:
1. ventricular filling.
2. the atrioventricular valves to close, and then the semilunar valves to open.
3. the semilunar valves to close, and then the atrioventricular valves to open.
4. pressure to become greater in the aorta and pulmonary trunk than in the ventricles.
Subtopic:  Human Heart: Cardiac Cycle |
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