Cardiac muscles contract

Quickly and they fatigue

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Quickly and remain unfatigued

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Slowly and are not fatigued

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Slowly and they fatigue

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Solution

The correct option is B Quickly and remain unfatigued
Cariac muscles is an involuntary, striated muscle that is found in only in the heart.
These are involuntary, show rhythmic contraction and relaxation quickly throughout their life. The cells are cylindrical, branched, uni-nucleate having faint cross striations and these muscles do not get fatigue under normal conditions. Hence option B is correct.

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