Glycolysis

Glycolysis is the first step in the breakdown of glucose to extract energy for cellular metabolism.

In the first half of glycolysis, energy in the form of two ATP molecules is required to transform glucose into two three-carbon molecules.

In the second half of glycolysis, energy is released in the form of 4 ATP molecules and 2 NADH molecules.

One glucose molecule produces four ATP, two NADH, and two pyruvate molecules during glycolysis.