<P> When the smaller , upper atria chambers contract in late diastole , they send blood down to the larger , lower ventricle chambers . When the lower chambers are filled and the valves to the atria are closed , the ventricles undergo isovolumetric contraction ( contraction of the ventricles while all valves are closed ) , marking the first stage of systole . The second phase of systole sends blood from the left ventricle to the aorta and body extremities , and from the right ventricle to the lungs . Thus , the atria and ventricles contract in alternating sequence . The left and right atria feed blood , at the same time , into the ventricles . Then , the left and right ventricles contract simultaneously as well . </P>
<P> When the smaller , upper atria chambers contract in late diastole , they send blood down to the larger , lower ventricle chambers . When the lower chambers are filled and the valves to the atria are closed , the ventricles undergo isovolumetric contraction ( contraction of the ventricles while all valves are closed ) , marking the first stage of systole . The second phase of systole sends blood from the left ventricle to the aorta and body extremities , and from the right ventricle to the lungs . Thus , the atria and ventricles contract in alternating sequence . The left and right atria feed blood , at the same time , into the ventricles . Then , the left and right ventricles contract simultaneously as well . </P>
where does the left ventricle send blood to
where does the left ventricle send blood to
aorta
aorta