Response to exercise

**Based on AQA biology specification ( can be used for revision). Includes: Content, AFL Questions, Exam style Questions and Answers
**

Based on AQA biology specification:

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.

(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.