<Table> <Tr> <Th> Stage </Th> <Th> AV valves * </Th> <Th> Semilunar valves </Th> <Th> Status of ventricles and atria ; and blood flow </Th> </Tr> <Tr> <Td> 1 Isovolumic relaxation </Td> <Td> closed </Td> <Td> closed </Td> <Td> semilunar ( pulmonary and aortic ) valves close at end of ejection stage ; blood flow stops . </Td> </Tr> <Tr> <Td> 2a Inflow : ( Ventricular filling ) </Td> <Td> open </Td> <Td> closed </Td> <Td> ventricles and atria together relax and expand ; blood flows to the heart during ventricular and atrial diastole . </Td> </Tr> <Tr> <Td> 2b Inflow : ( Ventricular filling with Atrial systole ) </Td> <Td> open </Td> <Td> closed </Td> <Td> ventricles relaxed and expanded ; atrial contraction ( systole ) forces blood under pressure into ventricles during ventricular diastole -- late . </Td> </Tr> <Tr> <Td> 3 Isovolumic contraction </Td> <Td> closed </Td> <Td> closed </Td> <Td> AV valves close at end of ventricular diastole ; blood flow stops ; ventricles begin to contract . </Td> </Tr> <Tr> <Td> 4 Ejection : Ventricular ejection </Td> <Td> closed </Td> <Td> open </Td> <Td> ventricles contract ( ventricular systole ) ; blood flows from the heart -- to the lungs and to rest of body during venticular ejection . </Td> </Tr> </Table>
<Table> <Tr> <Th> Stage </Th> <Th> AV valves * </Th> <Th> Semilunar valves </Th> <Th> Status of ventricles and atria ; and blood flow </Th> </Tr> <Tr> <Td> 1 Isovolumic relaxation </Td> <Td> closed </Td> <Td> closed </Td> <Td> semilunar ( pulmonary and aortic ) valves close at end of ejection stage ; blood flow stops . </Td> </Tr> <Tr> <Td> 2a Inflow : ( Ventricular filling ) </Td> <Td> open </Td> <Td> closed </Td> <Td> ventricles and atria together relax and expand ; blood flows to the heart during ventricular and atrial diastole . </Td> </Tr> <Tr> <Td> 2b Inflow : ( Ventricular filling with Atrial systole ) </Td> <Td> open </Td> <Td> closed </Td> <Td> ventricles relaxed and expanded ; atrial contraction ( systole ) forces blood under pressure into ventricles during ventricular diastole -- late . </Td> </Tr> <Tr> <Td> 3 Isovolumic contraction </Td> <Td> closed </Td> <Td> closed </Td> <Td> AV valves close at end of ventricular diastole ; blood flow stops ; ventricles begin to contract . </Td> </Tr> <Tr> <Td> 4 Ejection : Ventricular ejection </Td> <Td> closed </Td> <Td> open </Td> <Td> ventricles contract ( ventricular systole ) ; blood flows from the heart -- to the lungs and to rest of body during venticular ejection . </Td> </Tr> </Table>
when are all 4 valves of the heart closed
when are all 4 valves of the heart closed
Isovolumic relaxation Isovolumic contraction
Isovolumic relaxation Isovolumic contraction