In muscle cells during exercise, does lactic acid fermentation and aeorobic respiration occur at the same time, and does this mean the cell makes more or less ATP during this time?

The cell can't completely lack oxygen, which means that some of pyruvate will move into the mitochondrion, however, lactic acid is also produced which means that anaerobic respiration occurs. Is this reasoning correct or is there some other mechanism that I am skipping that doesn't allow these processes to simultaneously occur?

Also, the NAD+ used for glycolysis is regenerated and net 2 ATP is releaseD in glycolysis, but the NADH doesn't move into the mitochondrion, so if pyruvate moves into the mitochondrion at the end of glycolysis, then there will be less NADH in the mitochondrion, which makes sense because there is too little oxygen and too many electrons in the ETC.

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    $\begingroup$ You keep posting questions in which you provide no support for your statements, no context to your qustions and do not respond to requests for clarification. Please sort out the questions you have already asked before posting any more. $\endgroup$ – David Jan 20 at 20:06
  • $\begingroup$ @David In this case I believe the question is self evident and clear to understand, what part of it do you need more information about? $\endgroup$ – ten1o Jan 20 at 20:16
  • $\begingroup$ By posting one is asking others to spend time and effort providing an answer which will be of value to the "library of detailed answers" that this site aims to build. The poster therefore has a duty to write a good question, one that shows research (including previous questions here), is specific and explains the context in which the question is asked. If clarification is requested it should be provided. One should only "answer well-asked" questions. Until you respond to the queries to your ΔG question, I see no reason to consider others. $\endgroup$ – David Jan 21 at 16:20

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