Response to exercise (4.4.2.2) | AQA GCSE Combined Science: Trilogy (8464) — Biology — Higher | KnowledgeSet

Response to exercise

Biology (Combined Science) · GCSE · AQA · AQA GCSE Combined Science: Trilogy (8464) — Biology — Higher · Specification point · 4.4.2.2 · Bioenergetics · Respiration

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4.4.2.2 Response to exercise

Content	Key opportunities for skills development
$During exercise the human body reacts to the increased demand for energy. The heart rate, breathing rate and breath volume increase during exercise to supply the muscles with more oxygenated blood. If insufficient oxygen is supplied anaerobic respiration takes place in muscles. The incomplete oxidation of glucose causes a build up of lactic acid and creates an oxygen debt. During long periods of vigorous activity muscles become fatigued and stop contracting efficiently.$	$AT 1, 3, 4 Investigations into the effect of exercise on the body.$
$(HT only) Blood flowing through the muscles transports the lactic acid to the liver where it is converted back into glucose. Oxygen debt is the amount of extra oxygen the body needs after exercise to react with the accumulated lactic acid and remove it from the cells.$

Content

Key opportunities for skills development

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.

AT 1, 3, 4 Investigations into the effect of exercise on the body.

(HT only) Blood flowing through the muscles transports the lactic acid to the liver where it is converted back into glucose. Oxygen debt is the amount of extra oxygen the body needs after exercise to react with the accumulated lactic acid and remove it from the cells.