Every tissue is composed of cells. We can find three types of muscles in the body, all of them composed of myocytes. The correct option is muscle cells because they are the smallest living unit in the body.
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The muscular system is composed of all muscles in the body. Muscles are made of myocytes, the composing muscle cells. There are three types of muscles: smooth muscle, skeletal muscle, and myocardium.
- The smooth muscle is formed by fusiform cells, mononucleated, and no transversal striations. There is a protein contraction system, but not as organized as the one of the skeletal muscle. It provides sustained contractions not voluntary.
- Skeletal muscle constitutes the somatic musculature. The contraction of the skeletal muscle is voluntary and fast. Cells composing the striated muscle are significantly long and multinucleated. They arrange in bundles, where cells are parallel to each other.
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Myocardium cells are cylindrical and smaller than the skeletal muscle cells, with ramifications. Cardiac cells only have one nucleus, and occasionally there can be two. Actin and myosin filaments are arranged just as the skeletal ones, and the contraction of cardiac cells is molecularly very similar to the skeletal.
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