Phases of the Cardiac Cycle
Isovolumetric Contraction: Ventricles contract with no volume change, increasing pressure.
The cardiac cycle involves distinct phases, with isovolumetric contraction playing a key role in pressure buildup before blood ejection.
Phases of the Cardiac Cycle
Introduction
The cardiac cycle refers to the sequence of events in the heart that occur during one complete heartbeat. It ensures efficient blood circulation throughout the body.
Isovolumetric Contraction
Definition
Isovolumetric contraction is an essential phase of the cardiac cycle, characterized by ventricular contraction without volume change, leading to increased intraventricular pressure.
Physiological Mechanism
- Occurs immediately after atrial systole.
- Ventricles contract with all valves closed, preventing blood flow.
- Pressure rises, preparing for ejection of blood into arteries.
Clinical Significance
Understanding this phase helps in diagnosing conditions like ventricular hypertrophy and heart failure.
Conclusion
The isovolumetric contraction is a crucial stage in the cardiac cycle, ensuring efficient circulation by increasing ventricular pressure before ejection.
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