A-LevelBiologyTransport in mammals9700/12 · May/June 2018 · 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

B: The excitation wave has to pass through a small area of conducting fibres in the septum.

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Topic: Transport in mammals, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2018 Paper 1 Variant 2, question 30.

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