Question

Cells in the AV junction have their own? serving as a?

A) excitability; primary pacemaker
B) automaticity; main pacemaker
C) contractility; secondary pacemaker
D) automaticity; back up pacemaker

Answer 1

The cells in the AV junction have their own automaticity and serve as the secondary pacemaker in the heart.

Step-by-step explanation:

The cells in the AV junction of the heart have their own automaticity, serving as the secondary pacemaker. These cells are self-excitable and able to depolarize and fire action potentials on their own at set intervals, which determine the heart rate. The pacemaker cells transfer the depolarization to other cardiac muscle fibers through gap junctions, allowing the heart to contract in a coordinated manner.