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 the life of an

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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 the life of an organism. These muscles are structurally striated like skeletal muscles but functionally behave like smooth muscles because they are involuntary. Crucially,cardiac muscles are highly resistant to fatigue due to the presence of a large number of mitochondria and a rich blood supply,which ensures a continuous supply of oxygen and nutrients. Therefore,they contract quickly and rhythmically without getting fatigued.

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