Chapter 17.3, Problem 5QC

Summary Introduction

To review:

The three populations of cells in the heart, which acts as pacemakers, and the differences among them.

Introduction:

The heart is made up of cardiac muscle cells, which contract when there is an electrical excitation. Cardiac muscle cells do not get stimulated due to the nervous system. The modified cardiac muscle cells thatgenerate action potentials on their own are called pacemaker cells.