Between the two photosystems, electrons are transported successively, with photosystem I producing NADPH and photosystem II producing ATP.
Beginning at photosystem II, which is similar to the previously characterized photosynthetic reaction center of R. viridis, the electron flow channel begins.
Each photosystem receives electrons from a distinct source to replace any lost ones. While the PSII reaction center receives its electrons from water, the PSI reaction center receives its electron supply from PSII via an electron transport chain.
When chlorophyll or carotenoid molecules absorb light and enter a photoexcited state, electrons in Photosystem I gain energy.
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