Which of the following statements about how smooth muscle differs from skeletal or cardiac muscle are accurate? Smooth muscle: Select all that apply
A) Has dense bodies attached to actin filaments
B) Contains sarcomeres between Z lines and M bands
C) Contracts more rapidly than skeletal muscles
D) Has one centrally located nucleus
Ans: A, D
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Smooth muscle cells are spindle shaped and smaller than skeletal muscle fibers. Each smooth muscle cell has one centrally positioned nucleus. Smooth muscle contains dense bodies that are attached to the membrane, dispersed in the cell, and attached to actin filaments. Smooth muscle has slow contractions and no cross-striations. Sarcomeres are the functional units of cardiac and skeletal muscle only. The sarcomeres extend between Z lines and M bands.
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