Lecture3-2009W - Energetics of living cells How energy is...

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Energetics of living cells barb2right How energy is transformed and how it affects the organism Energy: the capacity to do work (e.g. chemical, transport & mechanical work) Forms of Energy (1) Chemical Energy: by reconfiguring atoms in food molecules barb2right activities (e.g. muscle contraction, active transport, etc) barb2right synthesis & degradation of biological molecules (=anabolism) (=catabolism) (2) Electrical energy: when positive and negative charges are separated (3) Mechanical energy (4) Heat = molecular kinetic energy Animals use energy to perform three major functions (1) Biosynthesis (e.g.) proteins, lipids (2) Maintenance (e.g.) nervous coordination, circulation, respiration (3) Generation of external work
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Why do animals need energy? checkbld Thermodynamic laws (a) The first law of thermodynamics: energy is neither created nor lost in the universe (b) The second law of the thermodynamics: all the energy of the universe will inevitably be degraded to heat and that the organization of matter will become
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