Ventricular outlets

Both ventricular outlets are verified using a fine pointed probe from each ventricular chamber into the respective aortic arch or pulmonary trunk. 

Once ventricular pressure exceeds the pressure in the aorta, the aortic valve opens and systolic ejection commences (C to D). Blood flows out from the ventricle into the aorta based on the pressure gradient, the inertances, and the resistances of the outlet. The muscle continues to contract until the cardiac action potentials have run their course. 

Once ventricular pressure exceeds the pressure in the aorta, the aortic valve opens and systolic ejection commences (C to D). Blood flows out from the ventricle into the aorta based on the pressure gradient, the inertances, and the resistances of the outlet. The muscle continues to contract until the cardiac action potentials have run their course. As the muscle begins to relax, pressure will drop until it falls below the aortic pressure. At this time, the aortic valve closes, and again blood flow ceases. Meanwhile, the ventricle continues to relax, decreasing the ventricular pressure. This period (D to A) is termed isovolumetric relaxation. Here, muscle relaxation can be thought of as increasing the compliance of the... 

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