Q. Which of the following is the correct pathway for propagation of cardiac impulse?
A) SA node $\rightarrow$ AV node $\rightarrow$ Bundle of His $\rightarrow$ Purkinje fibres
B) AV node $\rightarrow$ Bundle of His $\rightarrow$ SA node $\rightarrow$ Purkinje fibres
C) SA node $\rightarrow$ Purkinje fibres $\rightarrow$ AV node $\rightarrow$ Bundle of His
D) Purkinje fibres $\rightarrow$ AV node $\rightarrow$ SA node $\rightarrow$ Bundle of His
Explanation
The heart is formed of cardiac muscles which have the property of excitability and conductivity. When the cardiac muscles are stimulated by a specific stimulus these got excited and initiate the waves (depolarization) of electric potential called cardiac impulse. Cardiac impulse is propagated through SA node $\rightarrow$ AV node $\rightarrow$ Bundle of His $\rightarrow$ Purkinje fibres.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.