The movement of food within the alimentary canal is primarily caused by a process called peristalsis, which involves rhythmic contractions and relaxations of smooth muscles in the canal’s walls. These muscle contractions propel the food along the digestive tract.
Here’s a more detailed explanation:
Peristalsis:
This is a wave-like movement that propels food forward through the digestive system. It involves coordinated contractions of circular and longitudinal muscles in the alimentary canal.
Initiation of Peristalsis:
The process is often initiated when food enters the alimentary canal and stretches the muscular walls, triggering the smooth muscle contractions.
Role of Peristalsis:
Peristalsis helps in the movement of food through the esophagus, stomach, and intestines, facilitating digestion and absorption of nutrients.