Question

1. an impulse travels through the hearts conduction system in which of the following sequences?

a. atrioventricular (av) node, bundle of his, sinoatrial (sa) node, bundle branches, purkinje fibers
b. bundle of his, sinoatrial (sa) node, bundle branches, purkinje fibers, atrioventricular (av) node
c. purkinje fibers, bundle branches, bundle of his, sinoatrial (sa) node, atrioventricular (av) node
d. sinoatrial (sa) node, atrioventricular (av) node, bundle of his, bundle branches, purkinje fibers

Explanation:

The sinoatrial (SA) node is the heart's natural pacemaker and initiates the electrical impulse. It travels to the atrioventricular (AV) node, then to the bundle of His, followed by the bundle branches and finally the Purkinje fibers.

Answer:

d. Sinoatrial (SA) node, atrioventricular (AV) node, bundle of His, bundle branches, Purkinje fibers