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9 Respiration occurs in cells - Edexcel - GCSE Biology - Question 9 - 2023 - Paper 2
Question 9
9 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 e... show full transcript
Worked Solution & Example Answer:9 Respiration occurs in cells - Edexcel - GCSE Biology - Question 9 - 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 to support the increased physical activity. To meet this energy demand, the body needs to absorb more oxygen into the blood. Consequently, the respiratory system responds by increasing the breathing rate to take in more oxygen more quickly, allowing the muscles to perform at their best. Additionally, this elevated breathing rate helps to remove excess carbon dioxide produced during increased respiration.
Step 3
State two differences between aerobic respiration and anaerobic respiration.
Answer
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Oxygen Requirement: Aerobic respiration requires oxygen, whereas anaerobic respiration occurs in the absence of oxygen.
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Energy Yield: Aerobic respiration releases a higher amount of energy compared to anaerobic respiration, which produces significantly less energy.