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Section 3.1: Metabolism and Energy

Learn about metabolism, the set of chemical reactions in living organisms sustaining life through anabolism and catabolism. Discover how energy is converted into various forms and explore reactions like exergonic and endergonic, bond energy, and activation energy.

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Section 3.1: Metabolism and Energy

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  1. Section 3.1: Metabolism and Energy

  2. What is a “Metabolism?” -The term “metabolism” is how well our bodies are able to undergo chemical transformations in order for us to sustain life -The set of chemical reactions in living organisms

  3. What is a “Metabolism?” -human life is maintained by the 4 main macromolecules: proteins, lipids, carbs, and nucleic acids (DNA and RNA)

  4. 2 Forms of Metabolism: Anabolism And Catabolism

  5. Anabolism -Anabolism is the form of using energy to construct cell components ex. amino acids.

  6. Catabolism: -Catabolism is the form of breaking down large molecules ex. The transformation of nutrients in our bodies.

  7. What Does it Mean to “Burn” Calories? -Calories are forms of energy we consume • We convert Chemical Energy into: Kinetic Energy, Heat Energy, Electrical Energy, Sound Energy • Ex. Human Body Temp (37°)

  8. Chemical Reactions -In our bodies the energy is changed through a chemical reaction -Bonds between atoms are broken and changed so that the energy can be absorbed or released -We are able to burn/use energy from foods through a Exergonicreaction or an Endergonic reaction

  9. Bond Energy -Energy is required to break bonds -The bond energy is the minimum required energy to break bonds

  10. Activation Energy (Ea) -Energy is required for this reaction called activation energy http://youtu.be/YacsIU97OFc

  11. The 2 types of reactions when this occurs are called exothermic reactions and endothermic reactions. Exergonic Reaction-A chemical reaction where energy is released from the body Endergonic Reaction-A chemical reaction where the energy is absorbed from the body

  12. How to Calculate Energy in a Reaction Ex. The Combustion of Methane:

  13. Combustion Reaction A combustion reaction is when all substances in a compound are combined with oxygen, which then produces carbon dioxide and water.

  14. *Refer to Pg.129 in textbook*

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