The smooth muscle in the GI tract is unique in its ability to sustain prolonged contractions and maintain tension without fatigue. This is crucial for the slow, steady movement of food through the digestive system. Smooth muscle cells are connected by gap junctions, which allow for synchronized contractions. The circular muscle layer constricts the lumen of the GI tract, while the longitudinal muscle layer shortens the tract, together generating the peristaltic movements.
