BIOM 3200 Chapter Notes - Chapter 18: Intestinal Villus, Stomach, Intestinal Epithelium

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By the end of this unit you should be able to: In digestion, the gastrointestinal tract turns large molecules (polymers) into small molecules (monomers). After this occurs the monomers travel across the wall of the small intestine, into the blood and lymph, this is absorption. Therefore digestion and absorption are the primary functions of the digestive system. The composition of food is similar to a lot of body tissues, and therefore enzymes that digest food could also digest these tissues if there were nothing protecting them. The fully active digestive enzymes are normally confined to the lumen (cavity) of the gastrointestinal tract. In summary, the functions of the digestive system include: motility. Ingestion, mastication, deglutition (swallowing), and peristalsis/segmentation: secretion. Exocrine and endocrine: digestion, absorption, storage and elimination. The digestive system can be divided into the tubular gastrointestinal tract, and accessory digestive organs.

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