Glycolysis & Cellular Respiration

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Glycolysis & Cellular Respiration. (Reference Chapter 8). The Purpose. Convert the energy in organic molecules into a usable form (ATP) ATP can then be used for work. - PowerPoint PPT Presentation

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Glycolysis & Cellular Respiration(Reference Chapter 8)The PurposeConvert the energy in organic molecules into a usable form (ATP)ATP can then be used for work

Remember: food molecules contain more energy than most cells need to power their processes. So, food molecules are broken down to make many molecules of ATP. Gummy bear explosion.

5Who Goes Through Respiration?All living organisms go through some sort of cellular respiration (though many do not use the complete process) to make ATPPlants still go through cellular respiration!

The Two TypesAerobic RespirationRequires oxygenFully breaks down glucose to CO2 and makes LOTS of ATPRequires mitochondriaAnaerobic RespirationNo oxygen neededGlucose only partially degradedMakes small amounts of ATP more quicklyNo mitochondrial involvementIn Eukaryotic Cells (no bacteria no viruses)Fuel + Oxygen + ADP + P Carbon Dioxide + Water + ATP

3 stages, 2 of which take place in the mitochondria

Remember Cellular Respiration is why we inhale O2 & exhale CO2.Oxygen picks up the left-over electrons & H+ at the end of the Electron Transport Chain. If we dont have oxygen the whole thing backs up & stops.Carbon Dioxide is a waste product created in the Krebs Cycle when H+ & electrons are stripped off the product of glycolysis called pyruvic acid.Random FactsEvery cell contains on average about a billion ATP moleculesWe have at any time about 1 sextillion (100,000,000,000,000,000,000,000) ATP molecules in our bodyWe use all of them in minutes and must regenerate themThe average ATP molecule is made and degraded 3 times per minuteWe go through about 20 pounds worth of ATP every hour

111st Stage is Glycolysis:This step occurs in the CYTOPLASM of the cell & does not require OXYGEN. The product moves to mitochondria when oxygen is present.2nd Stage is Krebs CycleOccurs in the MITOCHONDRIA W/ Oxygen- The leftover molecule from glycolysis moves into the mitochondria by the process of DIFFUSION.-Its Bonds are broken & electrons are stripped & taken to the next step.-Carbon is released as CO2 (this is why we exhale CO2!!!)

3rd Stage is The Electron Transport Chain-In the inner membrane of the mitochondria-Uses oxygen-Gives mitochondria its reputation as the power house of the cell: A LOT of ATP is produced during this step-Electrons & H+ moving around eventually causes the creation of ATP.

16Oxygens role is to accept the stripped electrons & combines with hydrogen ions to form WATER. If you dont have oxygen you cannot clean up the electrons & H+ & the process comes to a halt. Then you cannot produce enough ATPand then your cells will die.Enough cell death & then youll die