Cellular Respiration

Glycolysis + Anaerobic or Aerobic Processes

Glycolysis

• First step of cellular respiration• Occurs in the cytoplasm [Cytosol]

Net Yield = 2 ATPWhat about the pyruvic acid?

If no oxygen…then Fermentation!

• Lactic Acid Fermentation• Microorganisms (Bacteria) and Muscles• Results in NAD+ for glycolysis…

or

• Alcoholic Fermentation• Some plant cells & unicellular organisms (yeast)

Glycolysis + Fermentation:

• Good News = Continued production of ATP• Bad News = Only enough energy

for unicellular and very small multicellular organisms

* What is a more efficient process?

Glycolysis + Aerobic Respiration

• Must add oxygen!

Aerobic Respiration

• Produces nearly 20 times as much ATP as glycolsis alone

• Two Stages: 1. Krebs Cycle2. Electron Transport Chain (w/ chemiosmosis)

Krebs Cycle (Citric Acid Cycle)

• Two “turns” breaks down the glucose and yields 2 ATP + CO2 waste

Electron Transport Chain (+ Chemiosmosis) = 34 ATP!

Cellular Respiration

Cellular Respiration + Photosynthesis