Characteristics of cardiac muscle cells:
They contract nearly in unison
They are resistant to fatigue
They contract with regular rhythm.
The myocardium, or cardiac muscle tissue, is a particular kind of muscular tissue that makes up the heart. This muscular tissue, which unconsciously contracts and relaxes, keeps the heart circulating blood throughout the body.
The heart also has specific cardiac tissue types that include "pacemaker" cells. In reaction to electrical signals from the neurological system, they shrink and expand.
Action potentials, or electrical impulses, are produced by pacemaker cells and instruct heart muscle cells to contract and relax. The heart's pacemaker cells regulate heart rate and blood pumping speed.
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