In muscles,aerobic respiration uses glucose derived from stored glycogen as energy source for the first ten minutes of activity; after over half an hour,_____________ becomes the main fuel source.
A) lactate
B) fatty acid
C) myoglobin
D) protein
E) blood glucose

Question

In muscles,aerobic respiration uses glucose derived from stored glycogen as energy source for the first ten minutes of activity; after over half an hour,_____________ becomes the main fuel source.  
A) lactate
B) fatty acid
C) myoglobin
D) protein
E) blood glucose

Quizplus · Accepted Answer

After over half an hour of activity, the body shifts to using fatty acids as the main fuel source for aerobic respiration in muscles.

In Muscles,aerobic Respiration Uses Glucose Derived from Stored Glycogen as Energy