What are the distinctive features of cardiac muscles?

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(N/A) Features of cardiac muscles are:
$(i)$ These are involuntary muscles that exhibit rhythmic contraction and relaxation throughout life.
$(ii)$ These muscles are composed of non-tapering cells with faint cross-striations.
$(iii)$ The cells of these muscles are cylindrical,branched,and uninucleate.
$(iv)$ These muscles do not get fatigued under normal conditions.

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