During a water-polo training session, a player completes repeated fast swims. Eventually the player's arm and leg muscles become fatigued.
Which process produces the substance that contributes to this muscle fatigue?
Aerobic respiration of glucose in the muscle cells.
Breakdown of glycogen to glucose in the muscle cells.
Conversion of glucose to ethanol in the muscle cells.
Anaerobic respiration of glucose in the muscle cells.
92 exam-style questions on AQA GCSE Biology 4.2 Respiration, covering 4.2.1 Aerobic and anaerobic respiration, 4.2.2 Response to exercise, and 4.2.3 Metabolism. Each one has a worked solution and a mark scheme showing where the marks go.