Cellular Respiration Energy From Food

What is Cellular Respiration ? Conversion of food/glucose into Energy (ATP) with oxygen present AEROBIC process= oxygen required Occurs in the mitochondria.

Tell your shoulder partner what the reactants and products are based on the pictures? What do you guess is the goal?

What’s the Equation? Chemical Equation: 6O 2 + C 6 H 12 O 6  6CO 2 + 6H ATP Energy Word Form: Oxygen + Sugar  Carbon dioxide + Water+ Energy (ATP) Reactants: –sugar (glucose) and oxygen. Products: –Carbon dioxide, water, and energy (ATP).

Where does it Take Place? -Mitochondria -The cristae (folds of mitochondria) is where ATP is made -3 separate reactions occur: Glycolysis, Krebs Cycle, Electron transport chain

What is Glycolysis? (Glucose Breaking) 1st step occurs in cytosol and is anaerobic 1 molecule of Glucose broken in half= 2 of pyruvic acid Makes 2 molecules of ATP Glucose is starting molecule Glucose -- 

 Pyruvic acid

Review Explain the role of organic (carbon based) compounds in CR. (p.131,132) For each 6 carbon molecule ( C 6 H 12 O 6 ), how many molecules of ATP are used and how many are produced? (p. 132,133)

What is the Krebs Cycle? 2 nd reaction of cellular respiration is aerobic/in mitochondria Begins when pyruvic acid from glycolysis enters mitochondria Pyruvic acid converted to CO2(waste product) (pg. 138) Makes 2 moleules of ATP

The Krebs Cycle Begins when pyruvic acid produced by glycolysis enters the mitochondrion. It is then turned to CO 2 (waste product) –And citric acid

What’s the Electron Transport Chain? 3 rd stage of cellular respiration is aerobic/in mitochondria Occurs in the cristae (folded membranes of mitochondria) Uses the high-energy electrons from Krebs to convert ADP to ATP. Total ATP 32. Produces Water as waste product

The Totals (ATP) Glycolysis=2 ATP Krebs Cycle=2 ATP Electron Transport=32 ATP TOTAL= 36 ATP from 1 glucose molecule

Why Glucose into ATP? It’s used to fuel/power cell activities 1.) ATP releases energy in a controlled way compared to glucose(think controlled fire vs explosion) 2.) ATP=immediate energy, glucose takes time

ATP = Adenosine Triphosphate = A—P—P—P high energy bonds When a cell needs energy, high energy bonds are broken by an enzyme. + P A—P—P—P A—P—P (ATP) (ADP) energy

THE BIG PICTURE Glucose &

Comparing Photosynthesis and Cellular Respiration Definition: What organelle: Reactants: Produces: Equation: What type of cell/ Organism:

Anaerobic vs. aerobic Anaerobic means without oxygen (glycolysis) Produces little ATP It is how our body makes most of the energy at the start of exercise Aerobic means with oxygen (Krebs cycle and ETC) Produces 20 times more ATP than glycolysis alone Body relies on it during extended physical activities

Normal Cellular Respiration

Lactic Acid Pyruvic Acid Lactic Acid Fermentation- Occurs in cytoplasm (anaerobic-no oxygen) and creates lactic instead of CO2 and H2O.

Lactic Acid Pyruvic Acid