The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
those fibers when they made to contract they have less mitochondrial density they will export lactate but they can export it to a neighbor neighboring red fiber so we call this the cell cell lactate shuttle where a fast glycolytic fiber produces lactate and it's consumed by an adjacent fiber and never even appears in the Venus blood except as CO2
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fast glycolytic fibers will be pale in color and they're they're pale because of less heem oxygen compounds they'll have less blood flow f capillaries PR fiber they'll have less myoglobin and mitochondria are the color of liver or vice versa liver is the color of mitochondria
as those cells uh accumulate lactate they realize that their neighboring type one cells can make even more use of the lactate given that they have a greater con or greater density of mitochondria so they'll shuttle the lactate from the twos to the ones is that correct
Initially the lactate gets recycled locally. Um, so it's shuttled um to neighboring type one fibers. So type it gets generated in the type two fiber, gets shuttled to a type one fiber. it gets converted back into pyuvate and then the pyuvate goes into the mitochondria to produce more ATP. Um that's called the lactate shuttle.