Ventricles are Contracting:
After a short delay, caused by the AVN, the ventricles fill and the atrial and ventricular walls contract simultaneously. This increases the pressure within the chambers and forces the AV valves shut. This causes a 'lub' sound. The SL valves are forced open due to increased pressure in the ventricles, and blood flows into the arteries. The ventricle walls are much thicker, particularly in the left ventricle, to push blood all the way around the body.
- Atria relaxed
- Ventricles contract
- SL Valve open
- AV Valve closed
- Blood flows into arteries
- Pressure highest in ventricles
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