Mechanical digestion is done in the stomach side by side along with peristalsis as the muscles in the wall of the stomach engage in mixing the food and digestive enzymes. The stomach is lined with layers of smooth muscle tissue. It has longitudinal, circular, and oblique layers which help in churning or grinding the food to break it down into smaller pieces. Peristalsis that occurs in the stomachâ€™s pylorus regionâ€™s proximity is the most vigorous.
The breaking down of food to convert it into chyme is done through these processes. Chyme is a creamy, viscous, or thick substance. It is then pushed down into the duodenum which is one of the regions of the small intestine and the greatest part of the digestion takes place in this region. Numerous enzymes are released in the small intestine, these enzymes breakdown biomolecules like proteins, fats, or carbohydrates. Various types of movements are also generated by the muscles of the small intestine. The food is moved and mixed with enzymes; juices and digestion are promoted through such movements.
Emulsification of fats is also considered a mechanical process. The emulsification is an important part of the digestion of the fats, which is done by mixing with bile in the duodenum. It does not digest the fats but breaks them down into small globules which are then processed mechanically.
Segmentation- Mechanical processing:
In the small intestine, the process of segmentation occurs. In this process, there are contractions of some areas of circular muscles called segments. This is controlled by the myenteric plexus which consists of fibers from both autonomic divisions. The second stage is the contraction of the areas which are present in the middle of each segment called sub-segments. The next stage involves the relaxation of the muscles of the segments. This process is repeated again and again. The aim of segmentation is not to propel the food further but rather to mix it up with the enzymes and churn it.
The last two portions of the small intestine are jejunum and ileum. These parts predominantly are involved in the absorption process. After passing through the small intestine, food passes into the large intestine. Here, the food along with the remaining nutrients and water gets absorbed. The fecal matter that is formed is stored in the region called the rectum. From there, it is egested out of the body by the process of egestion. Thus, during mechanical processing, the food also undergoes chemical processing where different digestive enzymes come into play. The enzymes of the digestive tract help in the breakdown and absorption of the food.
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