Wiggers Diagram/ Cardiac Cycle

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what occurs at "A" on the graph?

aortic semilunar valve opens

what occurs at the circled label "4" on the graph?

isovolumetric contraction

what does the circle label "5" indicate on the graph?

peak systolic pressure

What occurs at "B" on the graph?

semilunar valve closes

What occurs at the area labeled "D" on the graph?

both AV valves open and diastolic refilling beings

Put these phases of the cardiac cycle in the correct order. 1. opening of the semilunar valves 2. isovolumic contraction 3. beginning of atrial systole 4. closure of the AV valves 5. completion of ventricular filling 6. beginning of ventricular systole 7. ventricular relaxation 8. ventricular ejection

3,5,6,4,2,1,8,7


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