Final answer:
The three major types of glands in the intestinal tract are intestinal glands (crypts of Lieberkühn), goblet cells, and endocrine cells that produce digestive hormones.
Step-by-step explanation:
The three major types of glands present in the intestinal tract are intestinal glands, goblet cells, and the glands responsible for producing digestive hormones. Intestinal glands, also known as crypts of Lieberkühn, secrete intestinal juice, a slightly alkaline mixture of water and mucus, aiding in the lubrication and further digestion of chyme. Goblet cells are abundant in the colon and secrete mucus that facilitates the movement of feces and provides protection against the abrasive effects of acids and gases. The endocrine cells located in the mucosa throughout the stomach and small intestine contribute to digestion by secreting hormones such as gastrin, secretin, and cholecystokinin, which regulate the digestive process by acting on other digestive organs.