The fact that cardiac muscle is able to contract rhythmically even without the nerve implulses is called what?

Autorhymicity pacemaker cells

There are three types of muscles:
Musclaes on out side are Stirated voluntary muscles.
Heart is a striated involuntary muscle with automaticity. Impluse it generates for itself is called pacemaker activity; it has many levels of pacemaker activity but the most important one is called SinoAtria (SA) Node.

All the other muscles (Bladder, intestines etc.) ate nonstriated, involuntary muscles. myogenic action, controlled by the pacemaker (sinoatrial - s.a.) and atrioventricular (a.v.) nodes in the heart, which send electric impulses to the cardiac muscle causing it to contract

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