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Pressure changes during the cardiac cycle

This text delves into the intricate pressure changes that occur throughout the cardiac cycle, focusing on the phases of ventricular systole, atrial systole, and diastole. It explains the mechanics behind the closing of the AV valves, opening of semilunar valves, and blood flow dynamics. Additionally, it highlights the reason why the maximum pressure in the left atrium is lower than that in the left ventricle, attributed to the thicker muscle wall and greater pump distance of the ventricle.

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Pressure changes during the cardiac cycle

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  1. Pressure changes during the cardiac cycle

  2. Ventricle systole Atrial systole N L P Diastole

  3. What is happening at L-M L: Ventricular systole starts Ventricular pressure greater than atrial pressure. Therefore AV valves shut. M: Ventricular systole Pressure in ventricle exceeds that in aorta Semilunar valves open Blood enters aorta.

  4. What is happening and N and P N: Start of ventricular diastole Ventricular pressure less than aortic pressure Semilunar valves shut Preventing backflow of blood into ventricles P: Ventricular diastole Pressure in ventricle drops below atrium AV valves open Blood enters ventricle

  5. Why is the max pressure in the left atrium lower than max pressure in the left ventricle? • Ventricle has thicker muscle wall • Generates a higher pressure as it contracts • Pumps blood a greater distance then atria

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