Cardiac Cycle(100% Correct answers)
Describe Cardiac Cycle correct answersBeginning of one heart beat to the next including a
period of relaxation.
Systole means? correct answersContracting
Diastole? correct answersRelaxing(filing)
What condition must be present for blood to move from one chamber of the heart to the next?
correct answersThe 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? correct answersThat 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? correct answers1. 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. correct answersAll chambers are relaxed, AV
valves open blood flows into ventricles.
Describe phase 2 Atrial systole period. correct answersSA 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 correct answersVolume in ventricles at end of phase 2
Describe phase 3 Isovolumic contraction of ventricles. correct answersAtria repolarize and relax,
Ventricles depolarize, QRS complex, Ventricles initiate contraction, raising pressure closes AV
valves, Heart sound one turbulence against AV valves
Describe phase 4 Ventricular ejection. correct answersRising pressure causes aortic and
pulmonary semilunar valves to open,
Stroke volume correct answersamount ejected in ventricular ejection greater or equal to 70ml
Ejection fraction correct answersIs a product of sv/edv at rest 60% during vigorous exercise 90%
in a diseased heart 50%
End systolic volume correct answersamount left in heart after ejection usually 50ml
Describe Cardiac Cycle correct answersBeginning of one heart beat to the next including a
period of relaxation.
Systole means? correct answersContracting
Diastole? correct answersRelaxing(filing)
What condition must be present for blood to move from one chamber of the heart to the next?
correct answersThe 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? correct answersThat 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? correct answers1. 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. correct answersAll chambers are relaxed, AV
valves open blood flows into ventricles.
Describe phase 2 Atrial systole period. correct answersSA 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 correct answersVolume in ventricles at end of phase 2
Describe phase 3 Isovolumic contraction of ventricles. correct answersAtria repolarize and relax,
Ventricles depolarize, QRS complex, Ventricles initiate contraction, raising pressure closes AV
valves, Heart sound one turbulence against AV valves
Describe phase 4 Ventricular ejection. correct answersRising pressure causes aortic and
pulmonary semilunar valves to open,
Stroke volume correct answersamount ejected in ventricular ejection greater or equal to 70ml
Ejection fraction correct answersIs a product of sv/edv at rest 60% during vigorous exercise 90%
in a diseased heart 50%
End systolic volume correct answersamount left in heart after ejection usually 50ml
