ch369_ch 13-photosynthesis1

ch369_ch 13-photosynthesis1 - Chapters 9 - 12. If you can...

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Unformatted text preview: Chapters 9 - 12. If you can draw something like this, and it makes sense to you, then you understand quite a bit about how living things obtain energy from carbohydrates. lactate Generating ATP while exercising. Muscle activity requires energy. (ATP for myosin for muscle contraction) Where to get the ATP ? The ATP already hanging around in muscles will last approx. 1 or 2 seconds (one weight lift). creatine phosphate (or phosphocreatine) creatine phosphate + ADP <=====> creatine + ATP creatine kinase Creatine phosphate in muscle cells can donate phosphate to quickly make more ATP, right in the muscles. This ATP source lasts about another 5 seconds. Glycolysis can generate ATP for about another 30 seconds, until too much lactate accumulates. With slower ( aerobic ) exercise, pyruvate and lactate are not produced so fast. Pyruvate can be taken into the TCA cycle, generating NADH that can be used to make ATP by oxidative phosphorylation. Exercise fueled by glycolysis is anaerobic . Does not require O 2 . To get through a 5K run you need to use oxidative phosphorylation to make a steady supply of ATP ! This requires O 2 as the Fnal electron acceptor in the electron transport chain. So you will need to breath ! Exercise that is powered by ATP made in oxidative phosphorylation is aerobic . Cori cycle Liver glycogen Aerobic exercise: Keeps you going until your glycogen is used. Then stop and eat ! Blood transports glucose to muscles, and lactate from muscles, in Cori cycle . Weve learned a lot about how living things generate energy (stored as ATP) ! Except for plants. What do plants do ??? Photosynthesis - Chapter 13 Photosynthesis Photosynthesis uses the energy of sunlight to convert CO 2 into carbohydrates and other organic molecules that are useful to plants. Plant cells. The little green things are chloroplasts. Chloroplasts- where photosynthesis occurs. chloroplast Photosynthesis evolved early in the history of life....
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This note was uploaded on 08/26/2010 for the course CH 369 taught by Professor Kbrowning during the Spring '07 term at University of Texas at Austin.

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ch369_ch 13-photosynthesis1 - Chapters 9 - 12. If you can...

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