7. pressure in atrium dissipates as walls adjust to the pressure change. Volume remains constant as pressure rises. Ejection begins when pressure in the ventricle exceeds the pressure in the aorta, causing the aortic valve to open. Initially, aortic flow rates increase and ventricular volume decreases rapidly. Ventricular pressure falls rapidly.
Ventricular volume is constant.
This pressure dissipates as the mitral valve opens and ventriclar filling begins. B. Pressures are dramatically less. C. Tricuspid valve closes after, and opens before, the mitral valve. AV valve opens, ventricular volume increases to its maximum - End Diastolic Volume, pressure rises only slightly to End Diastolic Pressure. Initially pressure continues to rise then begins to fall.