Muscle tissue is specialized for contraction and consists of muscle fibers. There are three types of muscle tissue: skeletal, cardiac, and smooth. Skeletal muscle fibers are long, cylindrical, and multinucleated, with a striated appearance. Cardiac muscle fibers are branched and connected by intercalated discs, facilitating synchronized contractions. Smooth muscle fibers are spindle-shaped and found in walls of hollow organs like the intestines.