10 Questions
During which phase of the cardiac cycle do the two atria contract simultaneously?
Atrial Systole
Which valves are open during the Atrial Systole phase?
AV valves
What is the purpose of the Isovolumetric Ventricular Contraction phase?
To increase intraventricular pressure
When do the SL valves open during the cardiac cycle?
During the Ejection phase
What is residual volume?
The considerable amount of blood left in the ventricles
When do the SL valves close during the cardiac cycle?
When ventricular pressure drops below arterial pressure
What is the purpose of measuring blood flow, pressure changes, and blood volume throughout the phases of the cardiac cycle?
To monitor the efficiency of the heart
How many major events make up the cardiac cycle?
Two
Which wave of an ECG marks the beginning of the Atrial Systole phase?
P wave
What coincides with the onset of ventricular systole?
R wave of the ECG
Study Notes
Cardiac Cycle Phases
- The two atria contract simultaneously during the Atrial Systole phase.
Valves During Atrial Systole
- The AV valves (tricuspid and mitral) are open during the Atrial Systole phase.
Isovolumetric Ventricular Contraction
- The purpose of the Isovolumetric Ventricular Contraction phase is to build pressure in the ventricles.
SL Valves and Cardiac Cycle
- The SL (semilunar) valves open during the Ventricular Ejection phase.
- The SL valves close at the end of the Ventricular Ejection phase.
Residual Volume
- Residual volume is the amount of air remaining in the lungs after exhalation.
Purpose of Cardiac Cycle Measurements
- Measuring blood flow, pressure changes, and blood volume throughout the phases of the cardiac cycle helps to understand cardiac function and diagnose cardiovascular diseases.
Cardiac Cycle Events
- The cardiac cycle consists of 5-7 major events.
ECG and Atrial Systole
- The P wave of an ECG marks the beginning of the Atrial Systole phase.
Ventricular Systole
- The QRS complex of an ECG coincides with the onset of ventricular systole.
Test your knowledge about the cardiac cycle with this quiz! Learn about the events of contraction and relaxation in the atria and ventricles, and understand how blood flow, pressure changes, and blood volume are measured during each phase.
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