In anaerobic respiration what happens to most of the energy stored in glucose?

During anaerobic respiration, only a small amount of the energy stored in glucose is actually released and used. The majority of the energy is lost as heat. This is because anaerobic respiration is a less efficient process than aerobic respiration, which uses oxygen to break down glucose and release energy.

Here's a more detailed explanation of what happens to the energy stored in glucose during anaerobic respiration:

* Glycolysis: This is the first stage of anaerobic respiration, and it occurs in the cytoplasm of the cell. During glycolysis, glucose is broken down into two molecules of pyruvate. This process releases a small amount of energy, which is stored in the form of ATP (adenosine triphosphate).

* Pyruvate fermentation: This is the second stage of anaerobic respiration, and it occurs in the mitochondria of the cell. During pyruvate fermentation, pyruvate is converted into either lactate or ethanol. This process releases a small amount of energy, which is also stored in the form of ATP.

In total, anaerobic respiration only releases about 2 ATP molecules per molecule of glucose. This is in contrast to aerobic respiration, which releases about 36 ATP molecules per molecule of glucose.

The reason for this difference in efficiency is that anaerobic respiration does not use oxygen to break down glucose. Oxygen is a highly reactive element that can release a lot of energy when it reacts with other molecules. Without oxygen, anaerobic respiration cannot release as much energy from glucose.

As a result of its low efficiency, anaerobic respiration is only used by cells when oxygen is not available. When oxygen is available, cells will use aerobic respiration instead, because it is a more efficient way to release energy from glucose.