1. What happens when the pressure in the ventricles becomes lower than the pressure in the atria? A.the semilunar valves open B.the semilunar valves close C.the atrioventricular valves open D.the first heart sound occurs   2. Pressure is changed by changing ___ which the ventricles control through contraction and relaxation. A.temperature B.flow C.resistance D.volume E.charge   3. If the pressure in the ventricles is higher than the pressure in the atria, but lower than the pressure in the great arteries, which of the following is true? A.semilunar valves will be closed, but the atrioventricular valves will be open, ventricles will be filling B.both the atrioventricular and semilunar valves will be open and there will be flow through the ventricles C.the atrioventricular valves will be closed, but the semilunar valves will be open, ventricles will be ejecting blood C.both the atrioventricular and semilunar valves will be closed and there will be no flow of blood

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