Cardiac Cycle Physiology

• During ventricular depolarization, tension in the ventricles increases, which leads to closure of the mitral and tricuspid valves.
• The rise in pressure within the ventricles leads to ejection of blood from the ventricles.
• During ventricular ejection, the aortic and pulmonic valves open, and the ventricles eject blood.
• Isovolumetric relaxation occurs when ventricular pressure falls below pressure in the aorta and pulmonary artery.
• Ventricular filling occurs during atrial systole, and about 70% of ventricular filling takes place during this phase.
• Atrial systole supplies the ventricles with the remaining 30% of the blood for each heartbeat.

Test your knowledge on the events and phases of the cardiac cycle, including ventricular depolarization, ejection, and isovolumetric relaxation. Understand the sequence of valve operations and blood ejection during each phase.