Metabolism encompasses the biochemical reactions that occur within living cells to convert food into energy, enabling the organism to perform various life-sustaining functions.

Glycolysis, the initial stage of cellular respiration, takes place in the cytoplasm of the cell, where glucose is broken down into pyruvate, releasing energy in the form of ATP.

The Krebs Cycle, also known as the Citric Acid Cycle, generates NADH and FADH2, which are high-energy electron carriers that feed into the electron transport chain for ATP production.

The electron transport chain, a series of protein complexes, is located within the mitochondrial matrix, where electrons are passed along, releasing energy used to pump protons across the mitochondrial membrane.

Oxidative Phosphorylation, the final stage of cellular respiration, occurs in the mitochondrial matrix, where the energy released from the electron transport chain is used to generate ATP through the movement of protons back across the mitochondrial membrane.

NADH and FADH2, generated in the Krebs Cycle, serve as electron donors in the electron transport chain, passing electrons along the chain to generate energy for ATP production.

ATP, or adenosine triphosphate, is the primary energy currency of the cell, providing energy for various cellular processes, including muscle contraction, nerve impulse transmission, and chemical synthesis.

Glycolysis, the first stage of cellular respiration, involves the breakdown of glucose into pyruvate, releasing energy in the form of ATP and NADH.

During glycolysis, 2 molecules of ATP are produced through substrate-level phosphorylation, while 2 molecules of ATP are consumed in the preparatory phase, resulting in a net gain of 2 ATP molecules.

Oxidative Phosphorylation, the final stage of cellular respiration, generates the most ATP molecules through the movement of protons across the mitochondrial membrane, coupled with the transfer of electrons through the electron transport chain.

Oxygen serves as the final electron acceptor in the electron transport chain, enabling the transfer of electrons and the generation of a proton gradient for ATP synthesis.

Pyruvate, generated as a product of glycolysis, is converted into Acetyl CoA, which enters the Krebs Cycle as a substrate for further energy production.

The electron transport chain transfers electrons from NADH and FADH2 to oxygen, releasing energy used to pump protons across the mitochondrial membrane, driving ATP synthesis.

The Krebs Cycle, also known as the Citric Acid Cycle, is responsible for the complete oxidation of glucose, breaking it down into carbon dioxide and releasing energy in the form of NADH, FADH2, and ATP.

The proton gradient generated across the mitochondrial membrane during electron transport drives the synthesis of ATP through ATP synthase, an enzyme that utilizes the energy of the proton flow to phosphorylate ADP to ATP.