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The entire process of cellular respiration includes , fermentation , , the ( also known as the Citric Acid cycle ) , and Oxidative Phosphorylation at the that needs oxygen as the last electron acceptor .

The entire process of cellular respiration includes glycolysis , , pyruvate oxidation , the Kreb's Cycle ( also known as the ) , and Phosphorylation at the Electron Transport Chain that needs as the last electron .

Glycolysis needs an input of ATP to ouptut a total of ATP , meaning there is only a net gain of ATP .

Glycolysis is an process that takes place in the of the cell .

Glyclysis begins with glucose molecule that separates into pyruvate molecules . The electrons that are released by breaking the bonds are later carried by NAD + which are reduced to NADH .

Glyclysis begins with 1 molecule that separates into 2 molecules . The that are released by breaking the bonds are later carried by 2 NAD + which are to 2 NADH .

The products released from the process of glycolysis , besides ATP as energy , are 2 ; no is released at this point .

For each molecule of glucose that enters the cytoplasm , molecules of pyruvate then enter into the of the mitochondria . This means that when a single molecule of pyruvate enters the / Kreb's Cycle , as Acetyl - coA , that the products that are released are doubled . This releases / produces a total of CO2 , 6 NADH , FADH2 .

For each molecule of glucose that enters the cytoplasm , 2 molecules of then enter into the matrix of the . This means that when a single molecule of enters the Citric Acid / Cycle , as - , that the products that are released are doubled . This releases / produces a total of 2 CO2 , NADH , 2 FADH2 .

Glycolysis and are both anaerobic processes , and therefore can occur in the even if there is no present / available .

Fermentation in humans , some bacteria , and some fungi , release / create as a product .

After pyruvate enters the matrix of the mitochondria , help break it down further into a 2 - carbon compound called - , leaving 1 of the carbons from pyruvate to be exhaled or diffuse out of the cell as .

After the Citric Acid / Kreb's Cycle , all Carbons from the original glucose molecule are used up , released , or recycled into other products . However , the / energy released from each time a bond was broken has been " carried " by and FADH2 . This helps exemplify the Law of Thermodynamics .

These are " carried " to the Electron Transport Chain , which is located in the inner membrane of the . There , protein complexes can " push " H + ions across the membrane from the out into the , against their concentration gradient . This utilizes some of the energy that the electrons have brought to the ETC .

These are " carried " to the Electron Transport Chain , which is located in the inner membrane of the . There , protein complexes can " push " H + ions across the membrane from the out into the , against their concentration gradient . This utilizes some of the energy that the electrons have brought to the ETC .

The last electron acceptor , located in the of the mitochondria , is . When there is enough and H + inside the matrix , one of the products that can form from cellular respiration is , also known as metabolic water .

Finally , if there is enough O2 and enough energy from the electrons that are carried through the ETC , then the + ions in the can flow down their concentration gradient , across the , and back into the of the mitochondria . As this occurs , is being produced from ADP + Pi on the matrix side . A total of about 32 - 38 ATP can be created here ( how many does your professor say ? ! ) .

If there is NOT enough oxygen in the mitochondria to fulfill , then the cell will most likely utilize as a source of energy / ATP .