What happens during anaerobic respiration in animals?

During anaerobic respiration in animals, glucose is partially broken down without the use of oxygen, resulting in the production of lactic acid. This process typically occurs when oxygen levels are insufficient, such as during intense physical exercise. The body's demand for energy increases, and anaerobic respiration allows for a quick supply of energy.

In anaerobic conditions, glucose undergoes fermentation, leading to the accumulation of lactic acid, which can contribute to muscle fatigue. The pathway of anaerobic respiration is less efficient than aerobic respiration, yielding less energy per molecule of glucose. Therefore, while it allows for immediate energy release, it is not sustainable for long periods due to the negative effects of lactic acid buildup.

The other choices describe processes or outcomes related to aerobic respiration or do not accurately reflect the anaerobic conditions in animals.