Question

Which is the correct path of an electrical excitation from the pacemaker to a cardiocyte in the left ventricle (lv)?

1) Bundle of His - Purkinje fibers - Cardiocyte
2) SA node - AV node - Bundle of His - Purkinje fibers - Cardiocyte
3) AV node - Bundle of His - Purkinje fibers - Cardiocyte
4) SA node - Bundle of His - Purkinje fibers - Cardiocyte

Answer 1

The correct electrical excitation path from the pacemaker to a left ventricle cardiocyte goes from the SA node to the AV node, then through the Bundle of His, followed by the Purkinje fibers, and finally to the cardiocyte.

Step-by-step explanation:

The correct path of electrical excitation from the pacemaker to a cardiocyte in the left ventricle (LV) is through the initiation of an action potential by the sinoatrial (SA) node, which then proceeds to the atrioventricular (AV) node. After a brief pause to allow the atria to complete pumping blood, the impulse moves to the atrioventricular bundle (Bundle of His), through the left and right bundle branches, and finally to the Purkinje fibers that distribute the impulse to the cardiocytes of the ventricle.

Accordingly, the correct answer from the options provided is: 2) SA node - AV node - Bundle of His - Purkinje fibers - Cardiocyte.