electron transport chain


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High Level overview of the Electron Transport Chain


Presentation Transcript

The Electron Transport Chain (ETC) : 

The Electron Transport Chain (ETC) For Brillinger’s students who ride the short bus.

Things to know about ETC : 

Things to know about ETC It is an aerobic process. The ETC occurs across the membrane of the mitochondria within a human cell. It passes electrons and H+ atoms back and forth across the membrane, creating a proton gradient. ATP synthase is an enzyme that provides an enzyme coated channel in the mitochondria’s membrane. The role of the ETC is to create and store enough potential energy to make ATP. The ETC results in Oxidative Phosphorylation. Oxidative Phosphorylation is the process of adding a phosphorus group to ADP to produce ATP. The final products of the ETC are CO2, H20, and ATP.

ETC : 

ETC The ETC is ‘jump started’ by the ‘high energy’ NADH molecules from the Krebs Cycle. Electrons are passed along to lower and lower energy levels. H+ protons are moved along with the electrons into the inside of the Mitochondria. The final destination for these electrons is oxygen – which produces water (but not ATP). The H20 eventually makes it’s way to the lymphatic system, and eventually back to the blood supply. The movement of the electrons along the electron transport chain creates a potential energy that is being stored.


MAKING ATP The ATP is actually made by using the potential energy that was generated by moving H+ protons across the mitochondria’s membrane. There is now a high concentration of H+ protons inside the mitochondria. Active transport by respiratory enzymes moves the H+ protons to the inter membrane space, resulting in a high concentration of H+. The only exit for the H+ protons is to re-enter the mitochondria using ATP synthase channels and kinetic energy. The ATP synthase uses the energy from the H+ proton movement to add high energy phosphate to ADP – forming ATP! Aka….OXIDATIVE PHOSPHORYLATION The role of the ETC is to provide a gradient – a mechanism through which ATP can be produced. The ETC can yield 32-34 ATPs.

Doing the Math : 

Doing the Math Input = 1 molecule of Glucose Glycolysis nets 2 ATP Krebs Cycle produces 2 ATP ETC facilitates making 34 ATP TOTAL ATP 38 ATP*MOLECULES RESULTING FROM 1 MOLECULE OF GLCUOSE *Results may vary…. -1 or 2 ATP molecules.

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