Podcast
Questions and Answers
During which phase of the cardiac cycle do the atria contract and push blood out of the atria and into the ventricles?
During which phase of the cardiac cycle do the atria contract and push blood out of the atria and into the ventricles?
What happens during isovolumetric ventricular contraction?
What happens during isovolumetric ventricular contraction?
When does ejection occur during the cardiac cycle?
When does ejection occur during the cardiac cycle?
What is the purpose of isovolumetric ventricular relaxation?
What is the purpose of isovolumetric ventricular relaxation?
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What occurs during passive ventricular filling?
What occurs during passive ventricular filling?
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What initiates ventricular systole in the cardiac cycle?
What initiates ventricular systole in the cardiac cycle?
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What is the purpose of isovolumetric ventricular contraction?
What is the purpose of isovolumetric ventricular contraction?
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What is residual volume?
What is residual volume?
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What causes the SL valves to close during the cardiac cycle?
What causes the SL valves to close during the cardiac cycle?
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What happens during active ventricular filling?
What happens during active ventricular filling?
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Study Notes
Cardiac Cycle Phases
- Atrial contraction occurs during the atrial systole phase, where the atria contract and push blood out of the atria and into the ventricles.
- Isovolumetric ventricular contraction phase is characterized by ventricular contraction without any change in ventricular volume.
Ventricular Contraction and Ejection
- Ejection occurs during the ventricular ejection phase, where the ventricles contract and pump blood out of the heart.
- The purpose of isovolumetric ventricular relaxation is to allow the ventricles to relax and prepare for the next cycle of contraction.
Ventricular Filling
- Passive ventricular filling occurs when the ventricles relax and fill with blood from the atria.
- Active ventricular filling occurs when the atria contract and push blood into the ventricles.
Ventricular Systole Initiation
- Ventricular systole is initiated by the electrical signal from the atrioventricular (AV) node.
Isovolumetric Ventricular Contraction Purpose
- The purpose of isovolumetric ventricular contraction is to generate enough pressure to open the semilunar (SL) valves.
Residual Volume
- Residual volume is the volume of blood remaining in the ventricles after contraction.
SL Valves Closure
- The SL valves close due to the increased pressure in the aorta and pulmonary arteries, which exceeds the pressure in the ventricles.
Ventricular Filling Types
- Ventricular filling can be either passive or active, depending on the phase of the cardiac cycle.
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Description
Test your knowledge on the cardiac cycle with this quiz! Learn about atrial systole and isovolumetric ventricular contraction as you answer questions on the ECG, atrial and ventricular contractions, and valve function.
