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Revise AQA GCSE Biology 4.2.2 Response to exercise with the question bank, lessons, revision guides, and flashcards.
During exercise the human body reacts to the increased demand for energy. • The heart rate, breathing rate and breath volume increase during exercise to supply the muscles with more oxygenated blood. If insufficient oxygen is supplied anaerobic respiration takes place in muscles. The incomplete oxidation of glucose causes a build up of lactic acid and creates an oxygen debt. During long periods of vigorous activity muscles become fatigued and stop contracting efficiently.
