Why don t nerve cells do anaerobic respiration

Is there one? Under hypoxic conditions, nerve cells also undergo anaerobic respiration.

But it was extremely short-lived. Normally, anaerobic respiration is not performed, and the brain dies after a few minutes of lack of oxygen. Nerve tissues such as the spine will live longer.

Lack of oxygen can cause irreversible damage to the brain (which can be detected). The mechanism is complex, in simple terms, neurons in the brain.

The way cells store information is nerve impulses, in other words, tens of billions of nerve impulses occur in the human brain every moment. In hypoxia, ATP energy production is greatly reduced, and lactic acid is produced by anaerobic respiration.

and accumulated carbon dioxide.

It will cause serious toxicity to neurons and change the characteristics of nerve transmission - it is very similar to understand this process when the computer is powered off, the information (electron flow) in the memory will be lost, and the intrinsic conduction mode of neurons in the similar brain (memory storage mode, thinking mode is the nerve impulse conduction process of a specific circuit) will stop, and after stopping for a certain time, these conduction memories will be completely lost, which is manifested as brain damage (amnesia, motor center injury, etc.), This damage is further exacerbated and brain death can occur.

Nerve cells have a more demanding need for oxygen than muscle cells and connective tissue cells, so anaerobic respiration does not normally occur.

Because the atmosphere of the primitive earth did not contain oxygen. Therefore, the respiration mode of organisms at that time was anaerobic respiration. So aerobic respiration evolved from anaerobic respiration.

In my humble opinion, nerve cells can of course also undergo anaerobic respiration, but animal nerve cells have sufficient oxygen at all times (except for brain death), so in general, animal nerve cells do not consider anaerobic respiration

Anaerobic respiration.

The fermentation process anaerobic respiration is a form of cellular respiration.

According to the different classification methods of the final electron acceptor, cellular respiration is divided into three types: fermentation, aerobic respiration, and anaerobic respiration. Yeast brewing, homolactic acid fermentation, and heterolactic acid fermentation all belong to the category of fermentation, rather than anaerobic respiration. To put it simply, it is not anaerobic respiration that does not utilize oxidation using molecular oxygen.

But in the generalized sense of "anaerobic respiration", the two concepts are usually not distinguished.

Fermentation is often referred to as anaerobic respiration in microorganisms, which refers to the incomplete oxidation of organic matter by living cells. There is no molecular oxygen involved in this process. When the incomplete oxidation product after oxidation is alcohol, it is called alcohol fermentation, and the total reaction formula:

c6h12o6→2c2h5oh+2co2↑+2atp；If it is lactic acid, it is called lactic acid fermentation, and the total reaction formula is: C6H12O6 2C3H6O3+2ATP.

Under hypoxic conditions, only anaerobic respiration can be carried out to temporarily maintain its vital activities. Anaerobic respiration can eventually cause harm to plants, which may be due to the incomplete oxidation of organic matter and the production of less energy. Thus, due to the Pasteur effect, the rate of glycolysis is accelerated to compensate for the low ATP yield.

This will lead to the accumulation of incomplete oxidation products, which will be toxic to cells; In addition, it also accelerates the consumption of sugar, and there is a danger of depleting the respiratory substrate.

Anaerobic Respiration Formula:

Alcoholic fermentation: C6H12O6 2C2H5OH + 2CO2 + energy.

Arrow superscript: enzyme, this reaction occurs mainly in plants).

Malolactic fermentation: C6H12O6 2C3H6O3 + energy.

Arrow superscript: enzyme, this reaction occurs mainly in animals, but not absolutely, such as potato tubers and sugar beet tubers).

The whole process of anaerobic respiration.

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

Stage 2: In the cytoplasmic matrix, pyruvate is catalyzed by different enzymes to break down into alcohol and carbon dioxide, or converted into lactic acid.

It is important to note that the conversion of pyruvate to alcohol or lactic acid does not produce energy.

Anaerobic respiration. It refers to the complete or incomplete oxidation of organic carbon compounds, and the electrons removed are transferred to exogenous inorganic oxides (some organic oxides) through part of the electron transport chain and release less energy.

According to the different final electron acceptors, anaerobic respiration can be divided into nitrate respiration, sulfate respiration, sulfur respiration, carbonate respiration and fumarate respiration. The most typical of these is nitrate respiration.

Anaerobic respiration is not completely broken down, and some of the energy is stored in alcohol or lactic acid1

After mol glucose is decomposed into lactic acid, only 61 08kJ of energy is stored in ATP, and nearly 69% of the energy is lost in the form of heat energy

In plants, anaerobic respiration produces CO2.

C6H12O6 2C2H5OH+2CO2+ energy, but no CO2 production in animals.

C6H12O6 2C356O3+ Energy.

Human anaerobic respiration produces two molecules of lactic acid (3 carbon skeleton) from one molecule of glucose (6 carbon skeleton), 3 + 3 = 6, and there is no place to make carbon dioxide carbon; If carbon dioxide is produced, alcohol will inevitably be produced, and people do not have enzymes to produce alcohol, only enzymes that produce lactic acid, and alcohol produced by anaerobic respiration will produce CO2

Cellular respiration, aerobic respiration, and anaerobic respiration.

Aerobic respiration is the process in which cells completely oxidize and decompose organic matter to produce carbon dioxide and water with the participation of oxygen, and at the same time release a large amount of energy.

Anaerobic respiration is the process of generating alcohol and carbon dioxide and releasing a small amount of energy without the need for oxygen in the cells, and the process of generating alcohol and carbon dioxide and releasing a small amount of energy.