Chapter 5 ep - Chapter 5 EnergyThe Capacity for Work As...

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Chapter 5 Energy–The Capacity for Work As biologic work increases, energy transfer increases Biologic work is expressed in mechanical units Emerges only when a change takes place Bioenergetics Flow and energy exchange within a living system First Law of Thermodynamics Energy cannot be created or destroyed, but only transforms from one form to another without being depleted An expression of the conservation of energy principle - The body does not produce, consume, or use up energy; instead, it transforms energy from one state into another as physiologic systems undergo continual change Potential and Kinetic Energy System total energy = Potential energy + Kinetic energy Potential energy relates to structure or position o Example: Water at the dam top = trapped potential energy (energy of position) Kinetic energy relates to energy of motion with release of heat Biosynthesis Bound energy in one substance directly transfers to other substances to increase their potential energy Specific building-block atoms of carbon, hydrogen, oxygen, and nitrogen become activated and join other atoms and molecules to synthesize important biologic compounds and tissues Some newly created compounds provide structure; examples include bone or the bilayer lipid-containing plasma membrane that encloses each cell Energy-Releasing and Energy-Conserving Processes Exergonic
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