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Questions and Answers
Which event marks the beginning of ventricular systole?
During which phase of the cardiac cycle do the SL valves open?
What happens during the Isovolumetric Ventricular Relaxation phase?
What is the purpose of measuring blood flow, pressure changes, and blood volume throughout the cardiac cycle?
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Which valves are open during the Atrial systole phase?
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What is the purpose of the Ejection phase?
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What appears during the latter part of the Ejection phase?
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What is residual volume?
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What happens during Isovolumetric Ventricular Contraction?
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When do the AV valves open during the cardiac cycle?
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During which phase of the cardiac cycle do the atria contract and push blood out of the atria and into the ventricles?
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What is the purpose of measuring blood flow, pressure changes, and blood volume throughout the cardiac cycle?
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What is residual volume?
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What event marks the beginning of ventricular systole?
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Which valves are open during the Isovolumetric Ventricular Relaxation phase?
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What appears during the latter part of the Ejection phase?
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What happens during the Isovolumetric Ventricular Contraction phase?
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When do the AV valves open during the cardiac cycle?
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What is the purpose of the Ejection phase?
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During which phase of the cardiac cycle do the SL valves open?
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Study Notes
Cardiac Cycle Events
- Ventricular Systole Beginning: Marked by the closure of AV (atrioventricular) valves and initiation of ventricular contraction.
- SL Valves Opening: Occurs during the Ejection phase after ventricular systole when pressure in the ventricles exceeds that in the aorta and pulmonary artery.
- Isovolumetric Ventricular Relaxation: Phase where both the AV and SL valves are closed, and ventricles relax without a change in volume; pressure drops in the ventricles.
Purpose of Measurements
- Blood Flow, Pressure Changes, and Volume: These measurements are crucial for assessing cardiac function, understanding blood dynamics, and diagnosing cardiovascular conditions.
Valves During Cardiac Phases
- Atrial Systole Valves: AV valves are open to allow blood flow from the atria to the ventricles.
- Isovolumetric Ventricular Relaxation Valves: Both AV and SL valves are closed.
- AV Valves Opening: Occurs when the pressure in the atria exceeds that in the ventricles, typically during Diastole.
Ventricular Actions
- Ejection Phase Purpose: To propel blood into the arteries, crucial for systemic and pulmonary circulation.
- Latter Part of Ejection Phase: A decline in ventricular pressure occurs; residual blood volume remains in the ventricles after ejection.
- Residual Volume: The amount of blood left in the ventricles after ejection, important for understanding cardiac efficiency.
Additional Phases
- Isovolumetric Ventricular Contraction: Phase where the ventricles contract with both valves closed, leading to an increase in ventricular pressure without blood flow.
- Atrial Contraction Phase: Occurs during Atrial systole; this phase pushes blood from the atria into the ventricles, completing the filling of the heart chambers.
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Description
Test your knowledge of the cardiac cycle with this quiz. Learn about the events of contraction and relaxation in the heart, as well as how to measure blood flow, pressure changes, and blood volume.
