When intense exercise depletes oxygen in muscle cells faster than it can be replenished, these cells will produce ____ by ____.
A)ethyl alcohol; alcoholic fermentation
B)acetaldehyde; glycolysis
C)pyruvate; glycolysis
D)lactate; lactate fermentation
E)citrate; citric acid cycle

Question

Quizplus · Accepted Answer

When oxygen is depleted in muscle cells during intense exercise, pyruvate cannot enter the mitochondrial matrix for aerobic respiration. Instead, it is converted into lactate by lactate dehydrogenase in a process called lactate fermentation. This allows glycolysis to continue producing ATP for a short period of time before fatigue sets in.

When Intense Exercise Depletes Oxygen in Muscle Cells Faster Than