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Cellular Respiration Part II College Prep Natural Science Flora 2008.

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Presentation on theme: "Cellular Respiration Part II College Prep Natural Science Flora 2008."— Presentation transcript:

1 Cellular Respiration Part II College Prep Natural Science Flora 2008

2 Food Into Energy Cellular Respiration is the process that all cells use to break down glucose to yield the energy that cells need to function……. Cellular Respiration is the process that all cells use to break down glucose to yield the energy that cells need to function……. C.R. can occur with or without oxygen C.R. can occur with or without oxygen w/out oxygen is called anaerobic respiration w/out oxygen is called anaerobic respiration w/oxygen is called aerobic respiration w/oxygen is called aerobic respiration

3 Aerobic Respiration Glycolysis Glycolysis Krebs Cycle Krebs Cycle Electron Transport Chain Electron Transport Chain The result/goal of all of these processes is to produce ATP which gives the cells energy The result/goal of all of these processes is to produce ATP which gives the cells energy

4 Glycolysis Process by which a 6-carbon glucose molecule is broken down into two 3-carbon pyruvate molecules Process by which a 6-carbon glucose molecule is broken down into two 3-carbon pyruvate molecules Occurs in the cytoplasm Occurs in the cytoplasm Small amounts of ATP and NADH are produced Small amounts of ATP and NADH are produced ATP – energy transport molecule ATP – energy transport molecule NADH is a hydrogen and energy carrier NADH is a hydrogen and energy carrier ** If oxygen is present, then pyruvate enters the Krebs Cycle

5 Krebs Cycle Begins with pyruvate and is transported to the mitochondria Begins with pyruvate and is transported to the mitochondria CO 2 is released out of the pyruvate and more ATP and NADH are produced CO 2 is released out of the pyruvate and more ATP and NADH are produced CO 2 is released from the cell as gas CO 2 is released from the cell as gas Since glycolysis produced two pyruvate molecules, two turns of the Krebs cycle are required to break down both pyruvate molecules Since glycolysis produced two pyruvate molecules, two turns of the Krebs cycle are required to break down both pyruvate molecules

6 Electron Transport System Uses NADH from the previous stages and these molecules carry hydrogen and energy Uses NADH from the previous stages and these molecules carry hydrogen and energy ETS has a series of electron carrier molecules embedded in the inner membrane of the mitochondria ETS has a series of electron carrier molecules embedded in the inner membrane of the mitochondria As the electrons move from one carrier to the next they release energy As the electrons move from one carrier to the next they release energy With the energy they release, some of the protons are pumped across the membrane creating a concentration gradient With the energy they release, some of the protons are pumped across the membrane creating a concentration gradient

7 Cont. ETS As the protons diffuse back across the membrane they pass through and enzyme complex that synthesizes/makes ATP As the protons diffuse back across the membrane they pass through and enzyme complex that synthesizes/makes ATP The electrons and protons then join oxygen gas to form water The electrons and protons then join oxygen gas to form water This is the greatest ATP production process of all the three stages This is the greatest ATP production process of all the three stages

8 Summary of Aerobic Respiration Sugar + Oxygen Sugar + Oxygen Carbon Dioxide + water + ATP (energy)

9 Anaerobic Respiration Glycolysis takes place Glycolysis takes place Pyruvate is converted into other molecules and the Krebs cycle and the electron transport system do not occur - ** This is called fermentation Pyruvate is converted into other molecules and the Krebs cycle and the electron transport system do not occur - ** This is called fermentation Does not produce near as much energy as aerobic respiration, but gets some animals by when they need energy! Does not produce near as much energy as aerobic respiration, but gets some animals by when they need energy! Like you and me!! Like you and me!!

10 Homework Stop and Think (1-5) Stop and Think (1-5) Page 344 Page 344


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