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YOUR muscles switch to lactic acid fermentation when they run out of oxygen, and has been blamed for muscle soreness, but there is evidence that this is not true (too much may be evidence that your are not in shape)
Within an hour, it either diffuses into your blood and your liver breaks it down, or it can be converted back to pyruvate – then when oxygen is available it can enter aerobic respiration.
D. The hydrogens are pumped across the inner membrane, OUT of the matrix by a proton pump. The energy for this comes from the E.T.C. This causes a H + ion gradient (a.k.a. proton gradient).
E. As the hydrogen ions flow back in (WITH the gradient)
they pass through an enzyme (ATP synthase). One part of ATP synthase is a channel, the other part actually spins as H+ ions pass it. This gives the cell energy to put the phosphate back on to ADP to make ATP.
ATP synthase movie