Water, sunlight and CO2 are the three reactants in the photosynthesis process. The water enters the plant through the roots by the process of osmosis. The CO2 diffuses through the stroma. The sunlight is absorbed and enters the chloroplast. Once all these reactants are in the chloroplast by the time the xylem tubes. once all these reactions are in the chloroplast the plant turns them into two products.
The 2 products of photosynthesis are Oxygen (O2) abd glucose (C6H1206)The oxygen is a waste plant (Which we use) but the plant also makes glucose which it uses in the cellular respiration process.
Once the plant has glucose it takes it to the mitochondria of all in your body Where cellular respiration takes place) and it also takes oxygen (that we breath in) to the mitochondria of cell all around your body. These are the 2 reactions of cellular respiration.