Select all that are true Fiting occurs when the ventricle is relued In isovolumetric contuaction the venuricle is contractine but al valoss are ciosed The atria cells depolarize at the beeineing of the ventricular fieine phave When all valves are dosed blood cannot flow Valves in tive heart open eoly eon way Valves open when pressure is higlee en the hack side compared to than the leading foeforep side attor the vatre Wen the ventaicular inunde cells depolarize this leads to contration. Sirice the vempiculir mocvtes are connected by zap junctions, they cantract as a une and this genemates presure on the blost..