Question

what is the correct sequence of electrical conduction of the heart?
a av node, sa node, purkinje fibers, bundle of his
b bundle of his, right and left bundle branches, sa node, av node, purkinje fibers
c sa node, av node, bundle of his, right and left bundle branch, purkinje fibers.
d sa node, av node, purkinje fibers, bundle of his, right and left bundle branch

Explanation:

The electrical conduction of the heart starts with the SA (sinoatrial) node, which is the natural pacemaker. Then the impulse travels to the AV (atrioventricular) node. After that, it goes through the Bundle of His, then the Right and Left Bundle branches, and finally the Purkinje fibers to cause ventricular contraction. Option A has the wrong order (AV node before SA node). Option B starts with Bundle of His which is incorrect. Option D has Purkinje fibers before Bundle of His and Bundle branches which is wrong. Only option C follows the correct sequence.

Answer:

C. SA node, AV node, Bundle of His, Right and Left Bundle branch, Purkinje fibers.