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Questions and Answers
During which stage of the cardiac cycle does blood flow from the atria into the ventricles?
During which stage of the cardiac cycle does blood flow from the atria into the ventricles?
What occurs during the Isovolumetric Contraction stage of the cardiac cycle?
What occurs during the Isovolumetric Contraction stage of the cardiac cycle?
What is the main outcome of the Ventricular Ejection stage?
What is the main outcome of the Ventricular Ejection stage?
In which stage of the cardiac cycle is the pressure within the ventricles at its highest?
In which stage of the cardiac cycle is the pressure within the ventricles at its highest?
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Which of the following best describes the Isovolumetric Relaxation stage?
Which of the following best describes the Isovolumetric Relaxation stage?
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Study Notes
Cardiac Cycle
- The cardiac cycle encompasses the events of one complete heartbeat, beginning and ending with diastole.
- Two main phases: systole (contraction) and diastole (relaxation).
- Divided into four stages:
Stage 1: Ventricular Filling
- Latter stages of diastole.
- AV valves open.
- Atria empties blood into ventricles.
- Atrial contraction.
- Volume increases in ventricles.
Stage 2: Isovolumetric Contraction
- All valves are closed.
- Ventricle muscles contract.
- Volume remains constant.
- Pressure increases.
Stage 3: Ventricular Ejection
- Second part of systole.
- Aortic and pulmonary valves open.
- Blood is forced out of ventricles.
- Volume decreases.
- Pressure peaks, then decreases.
- Highest pressure during this stage.
Stage 4: Isovolumetric Relaxation
- First part of diastole.
- Ventricle muscle fibers relax.
- No change in volume.
- Pressure decreases.
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Description
This quiz explores the various stages of the cardiac cycle, detailing the phases of systole and diastole. Understand how the heart functions through ventricular filling, isovolumetric contraction, ventricular ejection, and isovolumetric relaxation. Test your knowledge on how these processes contribute to one complete heartbeat.
