Choose the correct answer from the alternatives given.
Which of the following muscle tissues composes the heart?

Myocardium

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Metacarpal

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Nucleatus

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Masseter

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Solution

The correct option is A Myocardium
Myocardium is the muscular middle layer of the wall of the heart. It is composed of spontaneously contracting cardiac muscle fibers which allow the heart to contract. Heart contraction is an autonomic (involuntary) function of the peripheral nervous system. The myocardium is surrounded by the epicardium (outer layer of the wall of the heart) and the endocardium (inner layer of the heart).
So, the correct option is 'Myocardium'.

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