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CAIE A-Level Biology 8.3.4 Cardiac Conduction System

Practise tracing myogenic excitation through the SAN, atrial muscle, AVN and Purkyne tissue, linking conduction timing to coordinated atrial and ventricular systole.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • sequence excitation from the SAN through atrial muscle until it reaches the AVN
  • explain how AVN delay allows atrial systole to finish before ventricular systole
  • trace Purkyne conduction from the apex upwards to coordinate ventricular contraction

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