Cardiac muscles contract:

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(B) Cardiac muscles are specialized involuntary muscles found in the heart. They exhibit rhythmic contraction and relaxation throughout an individual'

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Quickly and they do not get fatigued.

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(B) Cardiac muscles are specialized involuntary muscles found in the heart. They exhibit rhythmic contraction and relaxation throughout an individual's life. These muscles are structurally similar to skeletal muscles but functionally similar to smooth muscles in terms of being involuntary. $A$ key physiological characteristic of cardiac muscles is that they are myogenic and do not get fatigued,as they possess a high density of mitochondria and a rich blood supply to ensure continuous energy production.

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