There are 3 types of muscle tissue ; skeletal, smooth and cardiac. The muscle fibres of cardiac tissues are striated and branched. They have many nuclei. They make up the tissues of the walls of the heart. The smooth muscle cells/fibres are spindle shaped and compose the inner walls of lumens such as the Gastro Intenstinal Tract. The cells have one central nuclei. Skeletal muscle fibres are striated (but not branched) and make up muscle tissue that attach to the skeleton.