What is the duration range for aerobic metabolism?

Aerobic metabolism is a biological process that occurs when the body generates energy using oxygen to oxidize carbohydrates, fats, or proteins. This energy production method is predominant during prolonged exercise and at lower intensity levels, typically after the initial energy demands of anaerobic processes (which occur in short bursts of high-intensity activity) have been met.

The correct answer reflects the duration during which aerobic metabolism becomes the primary source of energy. It usually starts to take over after about two minutes of sustained activity and can last several hours as long as the cardiovascular system and oxygen supply can support ongoing activity, such as during distance running or cycling.

In contrast, the other options represent timeframes that align more closely with the anaerobic energy systems, which are primarily used for short-duration, high-intensity activities. Thus, the range of 120 seconds to several hours accurately captures the nature of aerobic metabolism and its role in energy production for extended periods of moderate exercise.