A-LevelBiologyControl and coordinationMay/June 2023Paper 4 Q77 Marks
(a) A striated muscle cell (muscle fibre) will contract when stimulated by a motor neurone at a neuromuscular junction. Air temperature can affect the temperature of striated muscle cells. Investigations have shown that the efficiency of contraction of striated muscle cells decreases when the air temperature decreases. Suggest reasons why a reduction in temperature can decrease the efficiency of contraction of striated muscle cells. [Figure 7.1]
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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