Glycolysis, kreb cycle and electron transport chain

Here's a breakdown of glycolysis, the Krebs cycle, and the electron transport chain:

Glycolysis: This is the initial stage of cellular respiration, occurring in the cytoplasm. It breaks down one molecule of glucose (a 6-carbon sugar) into two molecules of pyruvate (a 3-carbon molecule). This process yields a net gain of 2 ATP molecules and 2 NADH molecules.

Krebs Cycle (also known as the Citric Acid Cycle): This cycle takes place in the mitochondrial matrix. The pyruvate from glycolysis is converted into acetyl-CoA, which then enters the Krebs cycle. For each molecule of glucose (meaning two turns of the cycle), it produces 2 ATP, 6 NADH, and 2 FADH₂ molecules, and releases carbon dioxide as a byproduct.

Electron Transport Chain (ETC): Located in the inner mitochondrial membrane, this is where the majority of ATP is generated. The NADH and FADH₂ produced in the previous stages donate electrons to a series of protein complexes. As electrons move through the chain, energy is released and used to pump protons across the membrane, creating a gradient. This gradient drives ATP synthase, which produces a large amount of ATP (around 32-34 molecules per glucose). Oxygen acts as the final electron acceptor, forming water.