Cellular+Respiration



Cellular respiration occurs in three main stages: glycolysis, the citric acid/krebs cycle, and oxidative phosphoralation.  [|Cell Respiration Animation]
 * Cellular Respiration **

[|Citric Acid Tutorial] //

Glycolysis //
 * occurs in the cytoplasm
 * changes 6-carbon glucose into two 3-carbon pyruvates
 * uses two ATPs
 * creates four ATPs
 * two ATP net gain
 * two NADH created with electrons from hydrogen atoms
 * two H2O molecules produced

//

Citric Acid Cycle/Krebs Cycle //
 * pre-stage: changes pyruvate into Acetyl CoA
 * changes Acetyl CoA into 4-carbon molecule
 * produces two CO2 molecules
 * produces three NADH with electrons from hydrogen atoms
 * produces one ATP
 * produces FADH2 with electrons from hydrogen atoms



//Oxidative Phosphorylation //
 * electrons from NADH and FADH2 used to transport H+ ions across membrane
 * electrons move along through protein complexes and electron carriers to oxygen, the final electron acceptor
 * 1/2 oxygen atom bonds with hydrogen to form one H2O molecule
 * hydrogen ions move back across membrane through ATP synthase and catalyze ATP synthesis
 * produces 34 ATPs

