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Regulation of gastric function
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Regulation of gastric function : ウィキペディア英語版
Regulation of gastric function
The nervous system and endocrine system collaborate to increase gastric secretion and motility when food is eaten and to suppress them as the stomach empties. Gastric activity associated with eating is divided into three stages called the cephalic phase, gastric phase, and intestinal phase, based on whether the stomach is being controlled by the brain, by itself, or by the small intestine, respectively. These phases overlap and all three can occur simultaneously.〔Saladin Kenneth S.(2007) Anatomy & physiology the unity of form and function. Dubuque, IA: McGraw-Hill〕
A fourth phase of acid secretion is known as the basal state which occurs in the times between meals (interdigestive phase). The level of acid secretion during these times is regulated by body weight, individual, number of parietal cells, and time of day. Acid secretion is lowest in the morning before awakening and highest at night.〔
==Cephalic Phase==

The cephalic phase is the stage in which the stomach responds to the mere sight, smell, taste, or thought of food. About 30% of total acid secretion occurs BEFORE food enters the stomach. These sensory and mental inputs converge on the hypothalamus, which relays signals to the medulla oblongata. Vagus nerve fibers from the medulla stimulate the enteric nervous system of the stomach which, in turn, stimulates gastric secretion.〔

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