Which energy pathway is primarily used during endurance activities lasting longer than two minutes?

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The aerobic energy system is primarily used during endurance activities lasting longer than two minutes because it relies on the continuous supply of oxygen to generate energy. This system effectively breaks down carbohydrates and fats to produce adenosine triphosphate (ATP) through processes such as glycolysis, the Krebs cycle, and the electron transport chain.

During extended physical activities, the body's demand for energy persists, and the aerobic system becomes the dominant pathway, allowing for sustained effort as it can generate ATP at a slower but more efficient rate compared to anaerobic pathways. This is particularly important in endurance activities, such as long-distance running or cycling, where the goal is to maintain a steady output over an extended duration.

In contrast, the anaerobic energy system and the ATP-PC system are more suited for short bursts of high-intensity activity, such as sprinting or heavy lifting, where immediate energy is required but does not last beyond a couple of minutes. The lactic acid system does contribute in some ways to energy production over longer durations, but it typically serves as a supplement to the aerobic system before it becomes less effective due to the buildup of lactic acid, which can hinder performance. Therefore, for endurance activities exceeding two minutes, the aerobic energy system is indeed

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