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The function of the intestine in the alimentary canal primarily involves the transportation and further digestion of food as it moves from the stomach to the anus. This process includes the breakdown of nutrients, absorption into the bloodstream, and the eventual elimination of waste. The intestines are divided into the small intestine and large intestine, each playing vital roles in digestion and absorption, as well as in the formation of feces.

The transportation of food through the intestines ensures that the body extracts essential nutrients, which are then utilized for various physiological processes. This flow is crucial for maintaining the efficiency of digestion and guaranteeing that waste is expelled from the body in a timely manner.

While filtering blood and storing waste are important bodily functions, these roles are associated with organs such as the kidneys and rectum, respectively. Producing enzymes occurs mainly in the mouth and pancreas, rather than in the intestines themselves. Thus, the primary function of the intestine in the alimentary canal is accurately represented by transporting food effectively through the digestive system.