Cellular Respiration Chapter 8.3

Animal Plant Mitochondria

Cellular Respiration  Catabolic pathway  Organic sugars are broken down to release energy for the cell  Electrons are used for energy  (opposite of photosynthesis) C 6 H 12 O O 2 6 CO H 2 O

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

Outer membrane Intermembrane space Inner membrane Matrix Mitochondria

Glycolysis  Overall Purpose:  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)

Krebs Cycle (Citric Acid Cycle)  Overall Purpose:  In the presence of oxygen, pyruvate is broken down to carbon dioxide (CO 2 )  Takes place in the….  MITOCHONDRIAL MATRIX  Reactants :  Pyruvate  (ADP, NAD +, & FAD)  Products :  CO 2  (ATP, NADH, & FADH 2 )

 Overall Purpose:  High-energy electrons and hydrogen ions from NADH and FADH 2 are used to convert ADP to ATP  Electrons from NADH and FADH 2 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 & FADH 2)  Oxygen  Products :  (NAD & FAD)  water Electron Transport

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

 Mr. Anderson’s Podcast (Bozemanbiology): 

Lactic Acid Fermentation The equation for lactic acid fermentation after glycolysis is: pyruvic acid + NADH → lactic acid + NAD+