The Pathway Taken by an Electrical Impulse Through the Heart

Question

The pathway taken by an electrical impulse through the heart is _______.
A) AV node $\rightarrow$ SA node $\rightarrow$ cardiac muscle of atria  $\rightarrow$AV bundle $\rightarrow$ right or left bundle branch $\rightarrow$ muscle of ventricles
B) SA node$\rightarrow$ cardiac muscle of atria $\rightarrow$ AV node $\rightarrow$ AV bundle right or left bundle branch $\rightarrow$ muscle of ventricles
C) AV bundle $\rightarrow$ AV node $\rightarrow$ muscles of ventricles $\rightarrow$ muscle of atria $\rightarrow$ SA node
D) muscle of atria $\rightarrow$ AV node $\rightarrow$ muscles of ventricles $\rightarrow$ muscle of atria $\rightarrow$ SA node

Accepted Answer

The pathway taken by an electrical impulse through the heart is SA node$\rightarrow$cardiac muscle of atria$\rightarrow$AV node$\rightarrow$AV bundle right or left bundle branch$\rightarrow$muscle of ventricles. This is the correct sequence of events that occur during the conduction of electrical impulses through the heart. Option A is incorrect as it has the wrong sequence. Option C is incorrect because the sequence is wrong as the AV bundle should be situated between the atria and ventricles. Option D is incorrect as it doesn't follow the correct pathways.