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10 Cards in this Set
- Front
- Back
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define energy
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capacity to do work
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define work
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the product of a given force acting through a given distance
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define power
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the rate of work production
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how does heat affect bioenergetics?
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the body converts chemical energy to mechanical and heat
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how does temperature affect bioenergetics
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biological systems are temperature dependent
rates of biological or enzymatic reactions are also sensitive to heat (also pH) |
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what are the laws of thermodynamics?
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1. energy cannot be created nor destroyed
2. - always proceed in direction of randomness or disorder (entropy) |
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Exergonic vs. endergonic reactions?
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exergonic - gives up energy, negative enthalpy, if it's heat - exothermic
endergonic - take up energy from surroundings, positive enthalpy - if heat - endothermic |
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what is ATP's role in biological reactions?
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main intermediate that captures energy from exergonic reactions and gives energy to enzymes catalyzing energonic reactions
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describe free energy - G
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the amount of energy from total energy that can be used in a system
typical reactions in working humas muscle use 25% for work and 75% is given up as heat |
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what is an extremely powerful signal for metabolic control?
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changes in AMP and Pi with hydrolysis of ATP
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