Small Intestine is the extensively coiled structure of the alimentary canal...

Extensively Coiled Structure of Alimentary Canal

The alimentary canal is a long, muscular tube that extends from the mouth to the anus. It is responsible for the digestion and absorption of food. One of the distinctive features of the alimentary canal is its extensively coiled structure. This coiling is seen in various sections of the canal, including the small intestine, large intestine, and stomach. In this article, we will discuss the extensively coiled structure of the alimentary canal.

The Small Intestine

The small intestine is the longest section of the alimentary canal, measuring around 20 feet in length. It is divided into three parts: the duodenum, jejunum, and ileum. The small intestine is extensively coiled to increase its surface area for absorption. The coiling is achieved through the presence of circular and longitudinal muscles in the intestinal wall, which contract and relax to produce the coiling effect.

The Large Intestine

The large intestine is shorter than the small intestine, measuring around 5 feet in length. It is responsible for the absorption of water and electrolytes from the undigested food material. The large intestine is also extensively coiled, primarily in the form of haustra. Haustra are pouch-like structures that form in the wall of the large intestine due to the contraction of circular muscles. These pouches allow for the storage and movement of fecal matter.

The Stomach

The stomach is a muscular sac that is responsible for the mechanical and chemical digestion of food. It is also extensively coiled, primarily in the form of rugae. Rugae are folds in the lining of the stomach that allow for its expansion and contraction. When the stomach is empty, the rugae are more prominent, allowing for the stomach to expand. When the stomach is full, the rugae flatten out, allowing for its contraction.

Conclusion

In conclusion, the extensively coiled structure of the alimentary canal is a unique adaptation that allows for increased surface area and storage capacity. The coiling is seen in various sections of the canal, including the small intestine, large intestine, and stomach. This coiling is achieved through the presence of circular and longitudinal muscles in the intestinal wall, which contract and relax to produce the coiling effect.