Question

20.3 cardiac muscle tissue and the cardiac conduction system
during the conduction of the action potentials through the conduction pathway, there is a temporary delay at the
o atrioventricular node
o left and right bundle branches
o purkinje fibers
o sinoatrial node

Explanation:

The atrioventricular (AV) node delays the action - potential conduction. This delay allows the atria to contract and empty their blood into the ventricles before the ventricles contract. The sinoatrial (SA) node is the heart's natural pacemaker and initiates the electrical impulse. The left and right bundle branches and Purkinje fibers rapidly conduct the impulse to the ventricular myocardium for synchronized contraction.

Answer:

A. atrioventricular node