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Cellular Respiration

Explore the process of cellular respiration, breaking down glucose to produce ATP in mitochondria. Learn about Glycolysis, Krebs Cycle, Electron Transport Chain, and their energy conversions. Discover the link between aerobic respiration, breathing, and photosynthesis.

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Cellular Respiration

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  1. Cellular Respiration Converting Chemical Energy from Carbohydrates into Chemical Energy of ATP

  2. I. Cellular Respiration (Aerobic ) Purpose: Break down glucose into energy usable by cells (ATP). This process occurs in the mitochondria of animal and plant cells. Equation for Cellular Respiration

  3. Three steps of cellular respiration: Glycolysis: in cell’s cytoplasm. No need for Oxygen. C6H12O6 2 pyruvic acid (C3H4O3) molecules + 2ATP. (reactant) (products) O2 Why do you eat? Pyruvic acid Pyruvic acid Mitochondria Mitochondria H+ Glucose Glucose Electron Transport Chain Electron Transport Chain Krebs Cycle Krebs Cycle Glycolysis Glycolysis H2O H2O CO2 CO2 2 2 34 342

  4. Kreb’s Cycle: in cell’s mitochondria. Pyruvic acid is broken down into CO2 in energy extracting reactions 2 pyruvic acid molecules(C3H4O3)  CO2 + H+ + ATP + high energy e- Electron Transport Chain: in cell’s mitochondria. Uses high energy e- to produce ATP. Waste products of these reactions are low energy e- and H+. O2 absorbed by plants, combines with e- and H+ to make H2O (waste product) O2 Pyruvic acid Pyruvic acid Mitochondria Mitochondria H+ Glucose Glucose Electron Transport Chain Electron Transport Chain Krebs Cycle Krebs Cycle Glycolysis Glycolysis Why do you breathe (inhale O2 and exhale CO2)? H2O H2O CO2 CO2 2 2 34

  5. Energy Totals • 36 ATP units are released from one glucose unit • A unit of glucose molecules contains 686 kcal of stored energy. A unit of ATP stores 7.5 kcal. If 36 ATP units are released from the breakdown of glucose, how efficient is the transformation from energy stored in glucose to energy released as ATP? • 36 X 7.5 Kcal = 270/686 = 39% 61% of glucose energy is released as heat: what a waste!

  6. II. Relationships Aerobic Cellular Respiration and Breathing • Oxygen is required for the electron transport chain to operate and ATP to be synthesized. • Oxygen is taken in by humans as we breathe and carbon dioxide is released. Aerobic Cellular Respiration and Photosynthesis • These are “opposite processes.” • The products of photosynthesis are the reactants of respiration and vice versa. • Energy stored through photosynthesis is released through cellular respiration

  7. Organize the following organism in the Venn diagram below: Palm during daytime, palm tree during night time, human, lizard at night, green algae, dead leaf. Performs photosynthesis Performs respiration

  8. Organize the following organism in the Venn diagram below: Performs photosynthesis Performs respiration Dead leaf Palm during night time, Human, Lizard at night Palm during daytime, Green algae

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