What determines the body’s ability to supply oxygen during low-intensity exercise?

• A. The efficiency of the braking system
• B. The presence of anaerobic metabolism
• C. The capacity of aerobic metabolism
• D. The strength of the skeletal muscles

Answer: (C)

The body's ability to supply oxygen during low-intensity exercise is primarily determined by the capacity of aerobic metabolism. Aerobic metabolism refers to the process through which the body uses oxygen to convert carbohydrates and fats into energy. During low-intensity exercise, the demand for energy is typically met through this efficient energy system, which relies on a continual supply of oxygen.

As the intensity of exercise increases, the body may eventually reach a point where it requires more energy than can be supplied by aerobic metabolism alone. However, during lower levels of exertion, aerobic processes are optimal. Factors influencing aerobic capacity, such as cardiovascular fitness, lung function, and the efficiency of oxygen transport and utilization by muscle tissue, play a crucial role in determining how well oxygen is supplied during such activities.

In contrast, other options focus on different aspects of energy production or body mechanics that are less relevant at low exercise intensities. For instance, anaerobic metabolism typically comes into play during higher intensity or shorter-duration activities where oxygen availability is insufficient. The strength of the skeletal muscles relates more to their ability to generate force rather than their capacity to utilize oxygen effectively. The efficiency of a braking system is not pertinent to energy metabolism or oxygen supply in the context of exercise. Thus, the capacity of aerobic