Where are we going with this? The information on this page should increase understanding related to this standard: Model and understand aerobic respiration demonstrating the flow of matter and energy out of a cell and explain energy transfer systems. Also, compare aerobic respiration to alternative processes of glucose metabolism.
Glycolysis is the first step in cellular respiration. Of the three steps it is different in a couple of ways:
- It does not require oxygen, which makes it anaerobic.
- It occurs in the cytoplasm (the cytosol) of the cell; not the mitochondrion.
Using 2 ATP, the glucose molecule is broken into two 3-C molecules. (Wait! I thought we were trying to MAKE ATP. Are we doing this backwards?)
- 2 pyruvate (2 pyruvic acid)
- 2 NADH
- 2 ATP (2 where used up and 4 were created, so you end up with a net gain of 2, because math. )
Normally, your body uses oxygen after glycolysis to go on to the Krebs Cycle. However, when oxygen is not available, your body resorts to fermentation.
- Alcoholic - occurs in bacteria and yeast
- Lactic acid - occurs in humans (animals)