CARDIAC CYCLE LATEST SUMMARY UPDATED FOR 2025 ACTUAL QUESTIONS
WITH 100% VERIFIED SOLUTIONS 2023-2025
Describe Cardiac Cycle
Beginning of one heart beat to the next including a period of relaxation.
Systole means?
Contracting
Diastole?
Relaxing(filing)
What condition must be present for blood to move from one chamber of the heart to the next?
The pressure has to be greater in the chamber that has fluid presently and lower in the chamber
it wants to flow into.
What does Boyle's law state?
That there is an inverse relationship between pressure and volume, Change in pressure gradient
creates a change in volume and drives blood flow.
What are 6 phases of the cardiac cycle?
1. Diastasis 2. Atrial systole 3. Isovolumic contraction of ventricles 4. Ventricular ejection 5.
Isovolumic relaxation of ventricles 6. Ventricular filling
Describe phase 1 diastasis / quiescent period.
All chambers are relaxed, AV valves open blood flows into ventricles.
Describe phase 2 Atrial systole period.
SA node fires, atrial depolarization shown as P wave on EKG, Atrial kick last 20% or blood into
ventricle, heart sound 4 heard turbulence caused by blood rushing into ventricles
End diastolic volume EDV
Volume in ventricles at end of phase 2
WITH 100% VERIFIED SOLUTIONS 2023-2025
Describe Cardiac Cycle
Beginning of one heart beat to the next including a period of relaxation.
Systole means?
Contracting
Diastole?
Relaxing(filing)
What condition must be present for blood to move from one chamber of the heart to the next?
The pressure has to be greater in the chamber that has fluid presently and lower in the chamber
it wants to flow into.
What does Boyle's law state?
That there is an inverse relationship between pressure and volume, Change in pressure gradient
creates a change in volume and drives blood flow.
What are 6 phases of the cardiac cycle?
1. Diastasis 2. Atrial systole 3. Isovolumic contraction of ventricles 4. Ventricular ejection 5.
Isovolumic relaxation of ventricles 6. Ventricular filling
Describe phase 1 diastasis / quiescent period.
All chambers are relaxed, AV valves open blood flows into ventricles.
Describe phase 2 Atrial systole period.
SA node fires, atrial depolarization shown as P wave on EKG, Atrial kick last 20% or blood into
ventricle, heart sound 4 heard turbulence caused by blood rushing into ventricles
End diastolic volume EDV
Volume in ventricles at end of phase 2
