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Anaerobic respiration equation
The first stage: in the matrix of cytoplasm, it is exactly the same as the first stage of aerobic respiration. That is, one molecule of glucose is decomposed into two molecules of pyruvate under the action of enzyme, and a small amount of [H] and energy are released in the process.

The second stage: in the cytoplasm matrix, pyruvate is decomposed into ethanol and carbon dioxide or into lactic acid under the catalysis of different enzymes. It should be noted that in high school, the second stage of anaerobic respiration of cells will not produce energy.

But in the stage of university and biological research, the second stage of anaerobic respiration of cells actually produces a little energy. The reason why the new textbook ignores it is that it produces too little ATP to be synthesized, so it is distributed in the form of heat energy. Therefore, it can be considered that there is energy release in the second stage of anaerobic respiration in high school, but ATP is not synthesized.

Anaerobic respiration, also known as anaerobic respiration, is a kind of biological oxidation in which the hydrogen receptor at the end of respiratory chain is exogenous inorganic oxide (organic oxide in some cases).

Extended data:

The main process of anaerobic respiration:

In the hexose stage of glycolysis, glucose is first phosphorylated to produce glucose -6- phosphate under the catalysis of hexokinase, which consumes one molecule of ATP, and then converted to fructose-6-phosphate under the catalysis of isomerase, and then phosphorylated again to produce fructose-1, 6- diphosphate under the catalysis of fructose kinase, which consumes another molecule of ATP.

In the triose stage, fructose-1, 6- diphosphate is cracked under the catalysis of aldolase to generate dihydroxyacetone phosphate and glyceraldehyde -3- phosphate (two trioses of phosphate can be transformed with each other under the catalysis of isomerase), and the latter generates 1, 3- diphosphoglyceric acid under the catalysis of glyceraldehyde-3-phosphate dehydrogenase, and NAD+ is reduced to NADH at the same time.

Then 1, 3- diphosphoglyceric acid generates ATP and 3- phosphoglyceric acid in the substrate level phosphorylation catalyzed by glycerokinase, and 3- phosphoglyceric acid is converted into 2- phosphoglyceric acid under the catalysis of mutase, then phosphoenolpyruvate is formed under the catalysis of enolase, and finally pyruvate and ATP are generated in another substrate level phosphorylation catalyzed by pyruvate kinase.

Under anaerobic conditions, NADH is re-oxidized to NAD+ through the reductive metabolism of pyruvate. In the process of yeast alcohol fermentation, pyruvate is oxidized and decarboxylated under the catalysis of pyruvate decarboxylase to generate acetaldehyde, and then acetaldehyde is reduced to ethanol under the catalysis of alcohol dehydrogenase, and NADH is oxidized to generate NAD+.

In the glycolysis process of muscle hypoxia, lactate dehydrogenase catalyzes the conversion of pyruvate to lactic acid, and at the same time, NADH is oxidized to NAD+.

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