Question

In complete heart block, damage has typically occurred at the level of the ________?

1) SA node
2) Purkinje fibers
3) AV node
4) bundle of His
5) blood vessels

Answer 1

In complete heart block, damage has typically occurred at the level of the AV node or the bundle of His, which leads to an interruption of the electrical conduction in the heart, preventing normal heart rhythm and coordination.Therefore , the correct answer would be option 3 and 4.

Step-by-step explanation:

In complete heart block, damage has typically occurred at the level of the AV node or the bundle of His. This condition involves an interruption in the normal conduction pathway of the heart. The SA node normally initiates the action potential, which is then delayed at the AV node before spreading to the bundle of His, and thereafter to the bundle branches and Purkinje fibers leading to ventricular contraction. In complete heart block, this pathway is disrupted, usually at the AV node or within the bundle of His, leading to a dissociation of atrial and ventricular activity. Therefore, the correct answer is 3) AV node or 4) bundle of His.