how does cellular repiration release energy from food?

Answer 1

The first step glucose (from food) goes through is glycolysis where it generates a net of 2 ATP molecules and 2 NADH carriers of electrons. The result of glycolysis (pyruvate) enters the Citric Acid Cycle where 1 GTP (equivalent to ATP), 3NADH's are made, and one QH+ is made per every molecule of pyruvate. All the NADH's and QH+ are then put into the electron transport where all those hydrogens build up a proton gradient and power ATP synthase to bind ADP and inorganic Phosphate to create ATP. The ATP created is the energy created from the original glucose molecule

Answer 2

That is a pretty simple question with a possibly massive answer. I dont know how much detail you need but here is a summary.

The body digests food down to the basic component sugars, such as glucose which is C6H12O6. From glucose, the body can break down the molecule of glucose to CO2 and H2O through a huge series of chemical reactions within the Kreb Cycle. Basically, look up Krebs Cycle on Wikipedia for more details. (Every glucose molecule produces approx. 28-32 molecules of energy (or ATP))

Answer 3

Cellular respiration breaks down the food molecules in gradual steps, keeping the electrons to put through the electron transport chain. Some ATP is made in the earlier stages of respiration, but the electron transport chain provides the biggest pay-off in ATPs made.