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 Hello There! Today I will teach you the three 

main steps in order for Cellular Respiration to 

occur.We will look at the three 

processes:Glycolysis, The Krebs Cycle, and The 

Electron Transport Chain. Now lets get started.

Glycolysis is anaerobic process and takes place in the 

cytoplasm. Glycolysis uses 2 ATP molecules in order to break 

down glue

(a 6 carbon molecule) into 2 pyruvic molecules(a 3 carbon 

molecule. The aerobic process produces pyruvate whereas te 

anaerobic process produces lactate. At the end 4 molecules of 

ATP are produced and 2 NADP Molecules. They then get 

carried on to the next step. 

The Krebs Cycle is an aerobic process   and takes place in the 

mitochondria. The pyruvate molecules from glycolysis gets 

converted into acetyl-CoA -> Citric Acid. They then get converted 

into two carbon dioxide molecules and 2 NADH. The citic acid then 

gets broken down into 2 more carbon dioxide molecules. Electons 

get released and make 4NADH and 1FADH2. During that process 

one ATP gets created. Carbon dioxide gets released as you 

exhale. NADH and FADH2 get used in the Electron Transport chain.

The Electron Chain is an aerobic process and takes place in the 

mitochondria.The NADH and FADH2 bring electrons the ETC. This 

system contains electron bound electron carriers that pass 

electrons from one to another. The energy that is released is used 

to pump hydrogen ions across the membrane to the inter 

membrane space. The ATP Synthase enzyme uses the energy of 

this gradient to   produce ATP. All together 38 molecules of ATP 

got generated. The ATP gets use for activity. It is an energy 

source.

When there is no oxygen present after glycolysis, the next 

step is Fermentation which takes place in the cytoplasm. 

Pyruvate can either be converted into alcohol or lactic acid 

which are both byproducts. Fermentation releases carbon 

dioxide but does not make any ATP. It yields 2 molecules of 

ATP per molecule of glucose. It does not create ATP molecules 

like the aerobic process but enough to get by. Lactic Acid 

gives soreness and the alcohol is used in wine and yeast.

I hope you have learned all about Cellular Respiration. See 

you next time! :)

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