Question

multiple choice question
what in the sa node are the pacemaker cells that initiate a heartbeat?
o nodal cells
o neurons
need help? review these concept resources.

Explanation:

The sino - atrial (SA) node contains nodal cells which act as the natural pacemaker of the heart, initiating the heartbeat. Neurons are nerve cells and not the pacemaker cells in the SA node.

Answer:

A. nodal cells