Question

The digestion of food is completed in which part of the alimentary canal?
(a)Duodenum
(b)Ileum
(c)Stomach
(d)Large intestine

Answer 1

It is the last part of the small intestine and is approximately 2 to 4 meter in length and consists of digestive glands which secrete an enzyme for further digestion.

Complete answer:
The parts of the alimentary canal include the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The small intestine is the place for food digestion and the ileum extends into the large intestine. Jejunum and ileum are the final processes in completing the digestion; both have the presence of villi on their muscular walls which give them an extra surface area for the absorption of nutrients, and during this, the liquid and food particles are broken into nutritional components. When these nutritional components move through the ileum of the small intestine the nutrients are absorbed by villi present on the intestine’s wall and transferred to the bloodstream and liver.

Additional Information: Duodenum: Duodenum is the widest, shortest (25 cm), and most flexed part of the small intestine. It is the midgut part of the alimentary canal and is a C-shaped structure. The bile-pancreatic duct opens in the duodenum. The duodenum secretes cholecystokinin hormone.
Stomach- The stomach is the most distensible portion of the alimentary canal. It is the midgut part of the alimentary canal and is a J- shaped structure. The stomach is present at the upper left side of the alimentary canal, below the diaphragm. It is formed of five parts: cardiac stomach, fundus part, body, antrum, and pyloric. The stomach helps in mechanical churning and digestion of protein.
Large intestine- The large intestine also known as large bowel is the portion of the digestive system most responsible for the absorption of water from the residue of food. The ileum passes material through the ileocecal valve into the large intestine at the cecum.
So, the correct answer is ‘ileum’.

Note: The ileum can even be infected and a common disease is Ileitis or inflammation of the ileum. It is often caused by Crohn's disease but can be caused by a wide variety of other diseases like infectious diseases, spondyloarthropathies, vasculitides, ischemia, neoplasms, eosinophilic enteritis, etc.