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KEY CONCEPT The overall process of cellular respiration converts sugar into ATP using oxygen. Objectives. Describe the process of cellular respiration. Compare cellular respiration to photosynthesis. Vocabulary. Cellular Respiration
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KEY CONCEPT The overall process of cellular respiration converts sugar into ATP using oxygen.
Objectives • Describe the process of cellular respiration. • Compare cellular respiration to photosynthesis.
Vocabulary • Cellular Respiration • Process of producing ATP by breaking down carbon-based molecules when oxygen is present. • Aerobic • Process that requires oxygen to occur. • Glycolysis • Anaerobic process in which glucose is broken down into two molecules of pyruvate and two net ATP are produced. • Anaerobic • Process that does not require oxygen to occur. • Krebs Cycle • Process during cellular respiration that breaks down a carbon molecule to produce molecules that are used in the electron transport chain.
mitochondrion animal cell Cellular respiration makes ATP by breaking down sugars. • Cellular respiration is aerobic, or requires oxygen. • Aerobic stages take place in mitochondria.
Glycolysis must take place first. • anaerobic process (does not require oxygen) • takes place in cytoplasm • splits glucose into two three-carbon molecules • produces two ATP molecules
1 ATP mitochondrion matrix (area enclosed by inner membrane) and 6CO 2 energy 2 3 energy from glycolysis ATP inner membrane and and 6H O 6O 2 2 4 Cellular respiration is like a mirror image of photosynthesis. • The Krebs cycle transfers energy to an electron transport chain. • takes place inmitochondrial matrix • breaks down three-carbonmolecules from glycolysis Krebs Cycle • makes a small amount of ATP • releases carbon dioxide • transfers energy-carrying molecules
1 ATP mitochondrion matrix (area enclosed by inner membrane) and 6CO 2 energy 2 Electron Transport 3 energy from glycolysis ATP inner membrane and and 6H O 6O 2 2 4 • The electron transport chain produces a large amount of ATP. • takes place in inner membrane • energy transferred to electron transport chain • oxygen enters process • ATP produced • water released as awaste product
The equation for the overall process is: C6H12O6 + 6O2 6CO2 + 6H2O • The reactants in photosynthesis are the same as the products of cellular respiration.
Question/Answer • What is the function of cellular respiration? • Cellular respiration breaks down sugars to produce ATP for cell activities. • What process leads to cellular respiration, and where does it take place? • Glycolysis, which occurs in the cytoplasm • Does glucose actually react with oxygen during cellular respiration? Explain. • No, glucose is split by glycolysis prior to the aerobic parts of cellular respiration, when oxygen enters the process. • Where does cellular respiration occur? • Mitochondria • What are the reactants and products of cellular respiration? • The reactants are three-carbon molecules and oxygen. The products are water and carbon dioxide.