Three Types of Muscle Which of the following is an accurate description of smooth muscle? a. It is under voluntary control. b. It controls movement of limbs and joints. c. It controls itself, with some fine-tuning by the nervous and endocrine systems. d. It is found in hollow internal organs.
Smooth muscles are non-striated muscles. Smooth muscle cells are known as myocytes that have a fusiform shape can contract and relax like a striated muscle. However, smooth muscle tissue appears to show greater elasticity and function within a larger length-tension curve than the striated muscle. Smooth muscle tissue, unlike skeletal or cardiac tissues, does not have well-defined striations visible on the cells. This is because smooth muscle cells are structures in a different way than other muscle cells. the actin and myosin filaments in smooth muscle are arranged across the cell in a stacked pattern. This “staircase” arrangement of actin and myosin is somewhat different than the structure in skeletal and cardiac muscle. The actin filaments in smooth muscle run from one side of the cell to the other, binding to dense bodies and to the cell membrane. In smooth muscle, the actin and myosin fibers are arranged at angles to each other as they run through the cell.
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