What is a characteristic of aerobic metabolism?

Aerobic metabolism is characterized by its ability to produce energy in the presence of oxygen. This process occurs in the mitochondria of cells and is the primary energy system used during low to moderate-intensity activities where oxygen is available to help convert carbohydrates, fats, and sometimes proteins into ATP (adenosine triphosphate), the energy currency of the cell.

During aerobic activities such as steady-state cycling or running, the body utilizes oxygen to efficiently generate energy over extended periods. This type of metabolism is essential for endurance exercises because it allows for sustained energy production compared to anaerobic metabolism, which occurs without oxygen and is more limited in capacity and duration.

The other options do not align with the principles of aerobic metabolism. For instance, aerobic metabolism does not exclusively use glycogen but can also metabolize fats and proteins when needed. It is generally associated with lower to moderate intensity rather than high-intensity efforts, and it actively utilizes carbohydrates along with fats for energy rather than avoiding them. Hence, the defining feature that aerobic metabolism operates effectively when oxygen is present is crucial for understanding its role in physical activity, especially in endurance pursuits.