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Respiration occurs in cells - Edexcel - GCSE Biology Combined Science - Question 6 - 2023 - Paper 2
Question 6
Respiration occurs in cells. (a) Why do cells respire? A to produce nitrogen B to release oxygen C to produce glucose D to release energy (b) An athlete runs ... show full transcript
Worked Solution & Example Answer:Respiration occurs in cells - Edexcel - GCSE Biology Combined Science - Question 6 - 2023 - Paper 2
Step 1
Step 2
Explain why the breathing rate of the athlete increases when running.
Answer
When an athlete runs, their muscles require more energy. This increased energy demand leads to a higher consumption of oxygen and production of carbon dioxide. As a result, the athlete's breathing rate increases to supply more oxygen to the blood and expel the excess carbon dioxide produced during aerobic respiration.
Step 3
State two differences between aerobic respiration and anaerobic respiration.
Answer
- Aerobic respiration uses oxygen, while anaerobic respiration does not.
- Aerobic respiration occurs in the mitochondria and produces carbon dioxide and water, whereas anaerobic respiration occurs in the cytoplasm and produces lactic acid (or alcohol and carbon dioxide in yeast).