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Cellular respiration
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==Process== Cellular respiration occurs within the cells [[Mitochondrion|mitochondria]] and cytoplasm (jelly-like substance that fills a cell). The general chemical formula for cellular respiration is [[glucose]] + [[oxygen]] --> carbon dioxide + water + energy.<ref name="10-3-muscle-fibre">{{Cite book | last = Betts | first = JG | authorlink = | last2 = Young | first2 = KA | author-link2 = | last3 = Wise | first3 = JA | last4 = Johnson | first4 = E | last5 = Poe | first5 = B | last6 = Kruse | first6 = DH | last7 = Korol | first7 = O | last8 = Johnson | first8 = JE | last9 = Womble | first9 = M | last10 = DeSaix | first10 = P | date = Apr 25, 2013 | website = OpenStax |location=Houston, Texas|language=en |archive-url=|archive-date=|url-status= |chapter=10.3 Muscle Fiber Contraction and Relaxation |chapter-url=https://openstax.org/books/anatomy-and-physiology/pages/10-3-muscle-fiber-contraction-and-relaxation | title = Anatomy and Physiology | url=https://openstax.org/books/anatomy-and-physiology/pages/1-introduction |access-date=2022-01-28}}</ref><ref name="khanacademy">{{Cite web | url = https://www.khanacademy.org/science/high-school-biology/hs-energy-and-transport/hs-cellular-respiration/a/hs-cellular-respiration-review | title = Cellular respiration review | website = Khan Academy|language=en|access-date=2018-08-13}}</ref> For the human body, usable energy comes in the form of a molecule called [[adenosine triphosphate]] (ATP). Cellular respiration is then the way in which the cells of the human body turn nutrients into ATP; this process can be broken down into four core steps: # [[Glycolysis]]: the first step of cellular respiration is the breakdown of glucose into energy that the body can utilize. # [[Oxidative decarboxylation of pyruvate]]: this step is done by an enzyme called the Pyruvate Dehydrogenase Complex (PDC). # [[Citric acid cycle]] (Krebs cycle or TCA cycle): is a series of chemical reactions that take stored energy (proteins, fats, carbs) and convert them into ATP. # [[Oxidative phosphorylation]]: the last step of cellular respiration uses a combination of several enzymes and oxygen to create a large quantity of ATP from the energy-dense molecules that were broken down in the previous steps. [[File:Aerobic_respiration_diagram.gif|center|frameless|500x500px|Cellular respiration, also known as aerobic respiration]]
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