Final answer:
Oxygen uptake is the rate at which the body uses oxygen during physical activity. Higher levels of oxygen uptake signify better aerobic fitness and endurance.
Step-by-step explanation:
Oxygen uptake refers to the rate at which the body uses oxygen. During physical activity, the body requires more oxygen to produce energy. The oxygen is taken in by the lungs and transported to the muscles through the bloodstream. Higher levels of oxygen uptake indicate better aerobic fitness and the ability to sustain exercise for longer durations.
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