So within a T wave, we also have a slight increase in voltage. And what happens here is repolarization begins or repolarization continues. So repolarization begins in the st segment, but it continues and takes place fully within our T wave. So this is when the cells of the ventricle repolarized. During this stage, these ventricles essentially empty out all that blood into our blood vessels. And because the hydrostatic pressure now decreases within our ventricles, these two semi lunar valves close.