Nursing NUR201 Chapter Notes - Chapter 23: Chymotrypsinogen, Abdominal Cavity, Autonomic Nervous System
9 Apr 2018
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Document Summary
Food contains nutrients needed by the body for building and repair of tissues, and for sustaining metabolic reactions. Digestive system is responsible for breaking down food into molecules small enough for absorption through the cells lining its organs. The continuous tubular system, from mouth to anus, provides extensive surface area in contact with the external environment of the lumen. Closely associated with cardiovascular system for transport of absorbed substances. Anatomy: gastrointestinal (gi) tract, mouth, pharynx, esophagus, stomach, small intestine, and large intestine, accessory digestive organs, teeth, tongue, salivary glands, liver, gallbladder, and pancreas. This capability of the gi tract to mix and move material along its length is called motility: digestion. Digestive enzymes produced by the salivary glands, tongue, stomach, pancreas, and small intestine catalyze these catabolic reactions. A few substances in food can be absorbed without chemical digestion. These include vitamins, ions, cholesterol, and water: absorption.
