Pacemaker cells in the SA node
A)have a well-defined resting potential.
B)generate action potentials that spread to the myocardium.
C)are highly contractile.
D)have an action potential identical to contractile cardiac muscle cells.
E)are located in the left atrium.

Question

Quizplus · Accepted Answer

Pacemaker cells in the SA node generate action potentials that spread to the myocardium, initiating the contraction of the heart. They do not have a well-defined resting potential, are not highly contractile, and their action potential differs from contractile cardiac muscle cells. Additionally, they are located in the right atrium, not the left.

Pacemaker Cells in the SA Node