Cellular respiration is the process by which cells generate energy in the form of adenosine triphosphate (ATP) through the breakdown of glucose and other organic molecules.

Glycolysis is the first stage of cellular respiration, where glucose is broken down into two molecules of pyruvate.

During glycolysis, two molecules of ATP are produced, along with two molecules of pyruvate.

The Krebs Cycle, also known as the Citric Acid Cycle, occurs in the mitochondrial matrix.

The Krebs Cycle directly produces two molecules of ATP per molecule of glucose.

The Electron Transport Chain, along with Oxidative Phosphorylation, generates the majority of ATP during cellular respiration.

Oxygen serves as the final electron acceptor in the Electron Transport Chain.

NADH and FADH2 are electron carriers that transfer electrons from glycolysis and the Krebs Cycle to the Electron Transport Chain.

Cellular respiration has an overall efficiency of approximately 40%, meaning that about 40% of the energy stored in glucose is converted into ATP.

Oxygen is a reactant, not a product, of cellular respiration.

Pyruvate is the molecule produced during glycolysis that is converted into Acetyl CoA, which then enters the Krebs Cycle.

Pyruvate Dehydrogenase is the enzyme that catalyzes the conversion of pyruvate to Acetyl CoA.

NADH is the molecule produced during the Krebs Cycle that serves as the starting point for the Electron Transport Chain.

NADH Dehydrogenase is the enzyme that catalyzes the conversion of NADH to NAD+ in the Electron Transport Chain.

ATP Synthase is the enzyme that catalyzes the synthesis of ATP from ADP and inorganic phosphate during oxidative phosphorylation.