Question

choose the correct answer.
b marks what structure?
purkinje fibers
atrioventricular (av) node
common bundle
sinoatrial (sa) node

Explanation:

In the heart's conduction system, the atrioventricular (AV) node is located between the atria and ventricles. The SA node is the pacemaker (more superior), Purkinje fibers are in the ventricles, and the common bundle is part of the conduction pathway below the AV node. The structure marked B in a typical heart diagram (showing conduction or anatomy) corresponds to the atrioventricular (AV) node.

Answer:

B. atrioventricular (AV) node