Cellular Respiration

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  • Once upon a time, in a far away land, there was a little village called cell town where a poor man lived. He had many things that he wanted to buy but only had a few ATP left, the currency in his realm. 
  • One day, he met a man at the town square that told him that he could make up to 38 ATP just by investing 2 ATP in a process called cellular respiration. The poor man decided to try it and invested the ATP. 
  • The first step of the process was Glycolysis where the 2 ATP change to 2 ADP and broke up one glucose molecule into 2 G3P molecules also known as pyruvic acid. As a result, 4 ADP molecules are produced and they are changed to 4 ATP as they gain another phosphate and 2NAD+ are changed to 2 NADH. 
  • The next part of the process is the Krebs cycle where a G3P molecule from glycolysis goes through pyruvic oxidization where one of the CO2 molecules is released and Acetyl-CoA is added to create a resulting oxidized 2-carbon molecule called citric acid. That citric acid is enzamatically broken down to release CO2 and change a NAD+ to NADH and results in a 5-carbon compound that then creates 2 more ATP. 
  • The final step is the electron transport chain. In this step 2 NADH change to 2NAD+ that allows the FADH2 to release hydrogen and become FAD. The free H+protons move from the outer membrane through the inter membrane and into the inner membrane space to form a gradient. After that, the H+ travel through the channel and ATP synthase to the matrix as the ADP changes to ATP for a final total of 34 ATP! The released O2 and the H+ then combine to form water molecules as a byproduct. 
  • The poor man recieved all of the ATP produced in the cellular respiration process and was now rich as he had received 2 ATP from Glycolysis, 2 ATP from the Krebs Cycle, and 34 ATP from the Electron Transport Chain for a total of 23 ATP! 
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