The reaction center chlorophyll of photosystem I transfers its excited electrons through a series of carriers to ferrodoxin, a small protein on the stromal side of the thylakoid membrane. The enzyme NADP reductase then transfers electrons from ferrodoxin to NADP+, generating NADPH.
The functional components of photosynthesis are called photosystems, and they are identified by specific pigment organisation and association patterns. Photosystems are responsible for absorbing and transferring light energy, which implies transferring electrons. The thylakoid membranes contain photosystems in terms of physical location.
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