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Cellular Respiration Chapter 8.3.

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Presentation on theme: "Cellular Respiration Chapter 8.3."— Presentation transcript:

1 Cellular Respiration Chapter 8.3

2 Animal Plant Mitochondria

3 Cellular Respiration C6H12O6 + 6 O2 6 CO2 + 6 H2O Catabolic pathway
Organic sugars are broken down to release energy for the cell Electrons are used for energy (opposite of photosynthesis) C6H12O O CO H2O

4 Question Which cell organelle makes energy available to the rest of the cell? Mitocondria – energy powerhouse

5 Does not require oxygen
Cellular Respiration Krebs Cycle Electron Transport Glycolysis Anaerobic: Does not require oxygen Aerobic: Requires oxygen


7 Mitochondria Outer membrane Intermembrane space Inner membrane Matrix

8 Glycolysis What are the reactants in this process?
Glucose, 2 ATP, 2 NAD+ and 4 ADP What are the products of this process? 2 ADP, 2 NADH, 4 ATP, and 2 pyruvates

9 Glycolysis Overall Purpose: Takes place in the…. Reactants: Products:
Initial break down of GLUCOSE to release energy Produces ATP and NADH molecules for energy storage Takes place in the…. CYTOPLASM Reactants: Glucose (ADP & NAD+) Products: Two PYRUVATE molecules (ATP & NADH)

10 Krebs Cycle (Citric Acid Cycle)
Overall Purpose: In the presence of oxygen, pyruvate is broken down to carbon dioxide (CO2) Collect energized electrons to pass to the electron transport chain (NADH/FADH2 carriers) Takes place in the…. MITOCHONDRIAL MATRIX Reactants: Pyruvate (ADP, NAD+, & FAD) Products: CO2 (ATP, NADH, & FADH2)

11 Electron Transport Overall Purpose: Takes place in the…. Reactants:
High-energy electrons and hydrogen ions from NADH and FADH2 are used to convert ADP to ATP Electrons from NADH and FADH2 are passed to the electron transport chain Oxygen picks up the electrons (and hydrogen) to make water Hydrogen ions flow through ATP synthase to make ATP Takes place in the…. INNER MITOCHONDRIAL MEMBRANE Reactants: (NADH & FADH2) Oxygen Products: (NAD & FAD) Water ATP!!!!!


13 What about bacteria? Prokaryotic cells (bacteria) don’t have mitochondria… Electron transport takes place in the cell membrane!


15 Mr. Anderson’s Podcast (Bozemanbiology):


17 Anaerobic Respiration
Cells can function for a short time with little oxygen Cells continue to produce ATP through glycolysis Glycolysis only produces a small amount of ATP Limited by the availability of NAD+ Anaerobic respiration that follows glycolysis is called fermentation Fermentation occurs in the cytoplasm Two types of fermentation: Lactic acid fermentation Alcohol fermentation

18 Lactic Acid Fermentation
Enzymes convert pyruvate from glycolysis to lactic acid Transfer of electrons from NADH Skeletal muscles produce lactic acid when there is not enough oxygen Bacteria make lactic acid in the production of cheese, yogurt, and sour cream from milk

19 Alcohol Fermentation Occurs in yeast and some bacteria
Pyruvate is converted to alcohol and carbon dioxide NADH transfers electrons


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