A-LevelBiologyTransport in mammalsMay/June 2018Paper 1 Q301 Mark
Which statement explains why the ventricles contract after the atria?
AThe band of fibres between the atria and the ventricles conducts the excitation wave slowly.
BThe excitation wave has to pass through a small area of conducting fibres in the septum.
CThe excitation wave has to travel further to reach the base of the ventricles than to spread across the atria.
DThe excitation wave travels slowly through the Purkyne tissue to reach the base of the septum.
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of transport in mammals within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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