Here's why:
* Smooth muscle is found in the walls of internal organs, including the digestive tract. It contracts involuntarily, meaning you don't have to consciously think about making it move.
* Peristalsis is the process of wave-like muscle contractions that push food through the digestive tract. This process is driven by the coordinated contractions of smooth muscle.
While other tissues like epithelial tissue (lining the digestive tract) and connective tissue (providing structure) are also important, smooth muscle is the primary tissue responsible for the movement of food.
