06 Bioenergetics EXB101 F10

06 Bioenergetics EXB101 F10 - EXB 101 Exercise Physiology...

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EXB 101 Exercise Physiology Lecture 6 Bioenergetics and Metabolism
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KEY CONCEPT • The ability to do work, or EXERCISE, depends on the conversion of one form of energy to another.
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Bioenergetics: the study of the conversion of one form of energy to another in a biologic system • All biological processes are chemical reactions and must obey the fundamental rules governing chemical processes. • These fundamental rules determine: – How fast a reaction happens – How far a reaction proceeds to completion
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Bioenergetics: Key Points • All chemical reactions involve energy changes. If there is no energy change, nothing happens. • Chemical reactions in living organisms are catalyzed by enzymes. • Enzymes attempt to drive the reaction they catalyze toward equilibrium. • As enzyme-catalyzed reactions proceed toward equilibrium, they release energy.
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Bioenergetics: Key Points • The farther a reaction is from equilibrium, the more energy it can release. • At equilibrium, no energy is released. • Some energy released in a chemical reaction can be used to do work, the remainder is unavailable.
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Key Points Enzymes are involved in the majority of chemical reactions in the body. – Most reactions would not occur if it was not for enzymes. – Enzymes have high specificity – Their catalytic power is regulated Enzymes affect the RATE (~10 5 to 10 17 ), not the direction of a reaction. Factors affecting the rate of enzyme reactions: – Substrate concentration – Enzyme concentration – Temperature – pH
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Enzyme Reactions • Irreversible reaction • Large energy change • Nonequilibrium reaction • Less common • Often rate limiting step • Reversible reaction • Small energy change • Equilibrium reaction • Product also a substrate for the reverse reaction • More common S P S P
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Enzymes Enzymes are proteins. Enzymes are classified by the type of reaction they
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This note was uploaded on 11/02/2010 for the course GEL GEL 107 taught by Professor Jishin during the Winter '09 term at UC Davis.

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06 Bioenergetics EXB101 F10 - EXB 101 Exercise Physiology...

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