"passive refilling of the heart occurs during which phase of the cardiac cycle? "

It occurs during the first phase via venous return where blood returns from depleted organs and fills the atrium until the pressure causes the AV valves to open and passively fill 80% of the ventricle.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.