A-LevelBiologyTransport in mammals9700/12 · Feb/Mar 2017 · Q331 Mark
The contraction of the heart is coordinated through electrical impulses passing through the cardiac muscle. What is the correct order of part of the sequence of these impulses?
Aright and left atria → atrioventricular node → Purkyne tissue → ventricular walls
Bright and left atria → Purkyne tissue → ventricular walls → atrioventricular node
Cright and left atria → sinoatrial node → atrioventricular node → ventricular walls
Dsinoatrial node → right and left atria → Purkyne tissue → atrioventricular node
✓ Correct answer
A: right and left atria → atrioventricular node → Purkyne tissue → ventricular walls
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