A-LevelBiologyTransport in mammals9700/12 · May/June 2021 · Q271 Mark
The sinoatrial node initiates the cardiac cycle. What is the correct order in which the chambers of the heart contract?
Aatria and ventricles at the same time
Bboth atria then both ventricles
Cleft atrium, then left ventricle, then right atrium, then right ventricle
Dright atrium, then right ventricle, then left atrium, then left ventricle
✓ Correct answer
B: both atria then both ventricles
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