What characterizes peristalsis in the small intestine?

Peristalsis in the small intestine is primarily characterized by a coordinated contraction of smooth muscle that occurs in a specific sequence. This process involves the contraction of smooth muscle behind the food bolus, which propels it forward, and the relaxation of smooth muscle in front of the bolus to allow it to move through the digestive tract. This mechanism enables the continuous movement of food along the digestive system, ensuring that it progresses through the intestines efficiently.

The smooth muscle contractions create a wave-like motion that is crucial for the digestive process, as it helps mix the intestinal contents with digestive juices and facilitates nutrient absorption. This coordinated process is essential for maintaining proper digestion and preventing blockages in the intestinal tract.