In a sports medicine seminar, there is a specialist who is speaking about myocardium. What is she MOST likely to say during her presentation?

The myocardium is the muscular tissue of the heart. Cardiac muscle contracts involuntarily, meaning it works without people consciously guiding it, so choice B is correct. It is striated, but unlike skeletal muscle, it is not voluntary; it does not require strength training to keep the heart beating.

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