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Mock exam · Science
Your legs ache after a sprint. Explain what your muscles did differently, and why it left you with less energy.
When I sprint my muscles make lactic acid and that is what makes them ache. The lactic acid builds up until I rest, and then it goes away again.
3 / 5Half right
The lactic acid is right. What is missing is why: your muscles ran short of oxygen, so they respired anaerobically — which releases far less energy. Name the oxygen and this is full marks.
Insights
- Respiration products: solid. You name lactic acid without prompting.
- The gap is the cause — you know what appears, not why it appears.
- Three of ten answers lost marks for a missing final step.
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So why did your legs ache after the sprint?
- You
Because lactic acid built up in the muscle.
- Prof. Albert
Right. Now tell me what ran out first.
- You
ऑक्सीजन। क्या आप हिंदी में समझा सकते हैं?
- Prof. Albert
हाँ। ऑक्सीजन कम पड़ी, इसलिए श्वसन अवायवीय हुआ और ऊर्जा कम मिली।
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