Presentation on theme: "Cellular Respiration What is it? extracting the energy from glucose and using it to charge ADP to make ATP Who performs cell respiration? One way or another,"— Presentation transcript:
Cellular Respiration What is it? extracting the energy from glucose and using it to charge ADP to make ATP Who performs cell respiration? One way or another, EVERY LIVING THING
What’s the BIG PICTURE Well…that depends on the conditions. –If there is no oxygen (or no mitochondria), only steps in the cytoplasm happen –With O2 more energy can be “extracted” from glucose to put into ATP molecules
Cellular Respiration –What are the steps? –Anaerobic cell respiration Glycolysis + Fermentation –Aerobic cell respiration Glycolysis + Krebs Cycle + ETC Purpose is the same, just different methods.
Cell Respiration - Two types - Anaerobic respiration: O2 not needed; - done by yeast, certain bacteria, exhausted muscle cells of animals - produces 2 ATP per glucose - Two steps: - glycolysis - fermentation: alcohol or lactic acid
Steps Fermentation – - conversion of pyruvate to Alcohol and CO2 (yeast) or Lactic acid (exhausted muscle cells) - no more ATP generated - Purpose: “empties” electron carriers so glycolysis can happen again
Cell Respiration - SECOND type - Aerobic respiration: O2 needed -Requires mitochondria -Produces 36 ATP per glucose -Three steps: -Glycolysis (followed by shuttle step) -Krebs -Electron transport Chain
+ 6O 2 --- 6CO 2 + 6H 2 O - getting the energy back out of storage C6H12O6 ADP + P ATP Equation for Aerobic C. R. The equation that we use for cellular respiration is really AEROBIC cell respiration
Mitochondria Krebs cycle takes place in the matrix – Purpose: to break apart C-C and C-H bonds –Energy transferred to electron carriers and a few ATP
Step 1 Glycolysis: EXACTLY the same as the beginning of anaerobic respiration –BUT next step is different…
Step 1.5 Shuttle step– converts pyruvate to Acetyl-coA and moves it into the mitochondria –Releases some CO2, fills up some electron carriers (2 NADH) –Has many names: prep step, grooming step, etc.
Step 3 Electron Transport chain – –All the filled electron carriers (NADH, FADH2) dump their electrons here –Energy in electrons is transferred to to make 32 ATP –“dead” Electrons “caught” by O2 to make H2O