The contraction of which muscle is involuntary, vigorous and rhythmic?

Striated muscles

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Cardiac muscles

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Unstriated muscles

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None of the above

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Solution

The correct option is B Cardiac muscles
Cardiac muscles are the muscles of the heart. They are self-contracting, autonomically regulated (meaning involuntary) and must continue to contract in a rhythmic fashion for the whole life of the organism.
Thus, the correct answer is option (B), 'Cardiac muscles'.

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Involuntary muscle fibres lack this complex, required in the control of contraction of voluntary muscle fibres. Which of the following is this?

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