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In a previous video we gave an overview of the light dependent reactions what are essentially occurring across the silo or within or across the thylakoid membrane right and that we zoomed in on one, and we saw okay we have some energy from light exciting the electrons within the that chlorophyll pair that p680 chlorophyll a pair that electron that energized electron will then be transferred from one molecule to another and as it does so it'll go to lower and lower energy states and that released energy some of it will be used to transfer hydrogen protons across the membrane and then eventually that electron will make its way to photosystem 1 where it can get excited again if we think of it as the same electron it doesn't necessarily have to be the exact same electron, but we can think of that same electron as being excited again by light energy, and then it can once again go to lower and lower energy states and this time it's going to be used to reduce NADP+ to NADPH now NADPH itself is an input into the Calvin cycle, but ATP is another input we need for the Calvin cycle and the way that we produce ATP is that hydrogen ion concentration that increases on the inside due to it being essentially pumped across the membrane as well as the leftover hydrogen ions from the water after it's stripped of electrons to replace that excited that originally excited electron and pee in that p680 chlorophyll pair well that increased hydrogen ion concentration can be used to drive ATP synthase which creates ATP from phosphate and ADP, and we saw it we saw that over here without seeing the different components you get light excite the electron goes to lower and lower energy states as it does so as it's going from photosystem 2 to photosystem 1 some of that Energy's being used to pump hydrogen ions into the thylakoid lumen then that electron gets excited getting excited again and then as it gets transferred and goes to lower and lower energy states it can be used to produce NADPH where once again its electrons are still at a fairly high I energy state, so it's a strong reducing agent and so that's why it's valuable in the Calvin cycle that energy from acting as a strong reducing agent can be used to or helped in the creation or the eventual creation of the sugar and once again where is that electron once it gives it away how does it get replaced well it snags it from the water what I have here is a more detailed diagram that labels some actors and the important thing is really what we just covered and what we covered in more detail in the previous video the conceptual idea of what's happening in the light dependent reactions but a lot of times in your biology class or in your biology book you'll see the talk of things like a cytochrome complex and Plato quinone and things like that, and I want you to I want to look at that right now so that you're not intimidated when you see it and that you see that these are just the actors that we talked about so over here this...
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