The contraction of the heart is coordinated through electrical impulses passing through the cardiac muscle.
Which is the correct order of part of the sequence of these impulses?
1 )
right and left atria $ \to $ sinoatrial node $ \to $ atrioventricular node $ \to $ ventricular walls
sinoatrial node $ \to $ right and left atria $ \to $ atrioventricular node $ \to $ Purkyne tissue
3 )
sinoatrial node $ \to $ right and left atria $ \to $ Purkyne tissue $ \to $ atrioventricular node
4 )
sinoatrial node $ \to $ right and left atria $ \to $ Purkyne tissue $ \to $ ventricular walls
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