Chapter 4 - Muscle Tissue
Muscle cells (myofibers) synthesize and maintain the contractile function of connective tissue. Three types of muscle are recognized based on their distinctive structural and functional features: skeletal, cardiac muscle and smooth muscle.
Skeletal muscle is composed of long, multinuclear cells with the nuclei located at the periphery of the cell. The cells are striated because of the parallel arrangement of contractile filaments appear as an alternating series of transverse bands.
Cardiac muscle is composed of branched, mononuclear cells (occasionally bi-nucleate) with the nuclei located in the center of the cell. The cells show the same striations as skeletal muscle.
Smooth muscle contains the same contractile proteins as skeletal and cardiac muscle, but the less ordered array of contractile filaments does not produce striations.