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Biology Chapter 4 Section 4 – Overview of Cellular Respiration

Biology Chapter 4 Section 4 – Overview of Cellular Respiration. Key Concept: The overall process of cellular respiration converts sugar into ATP using oxygen. Cellular Respiration – the process of using oxygen to produce ATP by breaking down carbon-based molecules

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Biology Chapter 4 Section 4 – Overview of Cellular Respiration

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  1. Biology Chapter 4 Section 4 – Overview of Cellular Respiration Key Concept: The overall process of cellular respiration converts sugar into ATP using oxygen.

  2. Cellular Respiration – the process of using oxygen to produce ATP by breaking down carbon-based molecules C6H12O6 + 6O2 6CO2 + 6 H2O + ATP a sugar oxygencarbon dioxide water energy

  3. Cellular respiration is an aerobic process – it needs oxygen to happen • Makes most of the ATP that a cell needs • Takes place in the mitochondria • Before cellular respiration can happen, food has to be broken into smaller molecules like glucose

  4. Glycolysis – breaks glucose into 2 molecules that each have 3 carbons • Glycolysis is anaerobic – it does not need oxygen • Takes place in the cytoplasm of the cell • The products of glycolysis (the 3-carbon molecules) enter the mitochondria and are used in cellular respiration

  5. There are 2 main parts of cellular respiration: • Stage 1: Krebs Cycle – uses the molecules from glycolysis to produce a small amount of ATP and other molecules that carry energy to the next part of cellular respiration • carbon dioxide is a waste product of this process

  6. Stage 2: Electron Transport - energy carrying molecules from glycolysis and the Krebs cycle are moved through a chain of proteins and large numbers of ATP molecules are produced • oxygen enters the process and is used to make water molecules • heat and water are released as waste products

  7. Cellular Respiration is like a mirror image of photosynthesis. • Photosynthesis makes sugars and cellular respiration breaks down sugars • The chemical equations of the 2 processes are basically opposites.

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