the amount of atp that come out from every step in cellular respiration

Cellular respiration is a metabolic pathway that breaks down glucose and produces ATP. The stages of cellular respiration include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation.

1. Glycolysis: This is the first step in cellular respiration. It occurs in the cytoplasm of the cell and does not require oxygen. In this step, one molecule of glucose (which contains 6 carbons) is split into two molecules of pyruvate (each containing 3 carbons). This process produces 2 ATP molecules.

2. Pyruvate Oxidation: Each pyruvate from glycolysis goes into the mitochondrial matrix — the innermost compartment of mitochondria. In the matrix, each pyruvate is transformed into an Acetyl CoA molecule. This step does not produce ATP.

3. Citric Acid Cycle (Krebs Cycle): This cycle also occurs in the mitochondrial matrix. For each glucose molecule, two cycles are completed (one for each pyruvate). Each cycle produces 1 ATP, so a total of 2 ATP are produced in this step.

4. Oxidative Phosphorylation: This is the final stage of cellular respiration. It includes the Electron Transport Chain and chemiosmosis, which together produce a large amount of ATP. The exact number can vary, but it's usually about 34 ATP.

So, in total, cellular respiration produces a net gain of approximately 38 ATP per glucose molecule under ideal conditions (2 from glycolysis, 2 from the Krebs cycle, and about 34 from oxidative phosphorylation). However, in reality, the number is often closer to 30-32 ATP due to losses in the process.