Smooth muscle cells do not present transverse striation, characteristic of skeletal and cardiac muscle cells.
The reason for this is that the actin and myosin filaments are not aligned along the length of the cell. They are believed to be spiraled into the smooth muscle fiber.
Myocytes are uninucleated and spindle-shaped, that is, elongated and thin at the tapered ends. In these cells the contraction is involuntary and slow. You can decide when to wash your hands, but do not consciously control the movements of your stomach or the contraction of your heart. Occurs in the arteries, being responsible for their contraction; It also occurs in the esophagus, stomach and intestines and is responsible for peristalsis (or peristalsis) in these organs. Peristaltic movements are contractions in waves that displace food material within these organs of the digestive system.