During activities requiring aerobic endurance,
A) glycogen and glycolysis are the primary sources of reserve energy.
B) amino acids are not broken down.
C) most of the muscle's energy is produced in mitochondria.
D) fatigue occurs in a few minutes.
E) muscle hypertrophy often occurs.

Question

Quizplus · Accepted Answer

During activities requiring aerobic endurance, the primary source of energy is oxidative metabolism, which occurs in the mitochondria of the muscle cells. Glycogen and glycolysis may be used as a secondary source of energy, but the majority is produced through oxidative metabolism. Amino acids may also be broken down, but this is not the primary source of energy. Fatigue may occur over time due to depletion of energy sources, but it does not typically occur within a few minutes of activity. Muscle hypertrophy may occur with resistance training, but not necessarily with aerobic endurance activities.

During Activities Requiring Aerobic Endurance