Here's why:
* Cellular Respiration: This is the process by which cells break down glucose (a sugar) to generate energy in the form of ATP.
* Glycolysis: This is the first stage of cellular respiration. It occurs in the cytoplasm of the cell and does not require oxygen.
* Anaerobic: This means that the process does not require oxygen.
How Glycolysis Works (Simplified):
1. Glucose is split: Glucose is broken down into two molecules of pyruvate.
2. Energy is produced: In the process of splitting glucose, a small amount of ATP and NADH (a reducing agent) are produced.
Important Note: While glycolysis doesn't require oxygen, it's not the end of the story. If oxygen is available, the pyruvate molecules will continue through the aerobic stages of cellular respiration (Krebs cycle and electron transport chain) to produce much more ATP. But if oxygen is limited, the pyruvate will undergo fermentation (lactic acid or alcoholic fermentation) to regenerate NAD+ needed for glycolysis to continue.
