Biology · Bioenergetics. The idea in plain words, the rules to remember, the mistake to avoid and a worked example, written and checked by Mega Lecture.
Respiration is an exothermic reaction that goes on all the time in every living cell. It transfers the energy the organism needs for building larger molecules, for movement and for keeping warm.
Aerobic respiration uses oxygen and takes place mostly in the mitochondria. Anaerobic respiration happens without oxygen. The glucose is not fully oxidised, so much less energy is transferred.
During exercise the heart rate, breathing rate and breath volume all rise to bring more oxygenated blood to the muscles. If oxygen is still too low, the muscles also respire anaerobically. Lactic acid builds up, an oxygen debt is created and the muscles become fatigued.
Writing carbon dioxide as a product of anaerobic respiration in muscles. Muscles make lactic acid only; it is yeast and plant cells that make ethanol and carbon dioxide.
Answer: The breathing rate increased by 150%.
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