During isovolumetric relaxation group of answer choices the av and semilunar valves are open and ventricular pressure is increasing. the av and semilunar valves are closed and ventricular pressure is increasing. the av and semilunar valves are open and ventricular pressure is decreasing. the av valves are open, the semilunar valves are closed, and ventricular pressure is decreasing. the av and semilunar valves are closed and ventricular pressure is decreasing.