Question
In: Biology
name the 3 phases of digestion and what occurs at the stomach in each phase
name the 3 phases of digestion and what occurs at the stomach in each phase
Solutions
Expert Solution
The three stages of digestion are,
1. cephalic phase
2. Gastric phase
3. Intestinal phase
1. Cephalic phase: It is the initial stage of the digestion
process, where the stomach responds to sight, smell and taste of
food, the acids responsible for the digestion are secreted befor
the food enters the stomach. The vagal postganglionic muscarinic
nerves release Acetylcholine, Ach stimulates the cell H+
secretion.
2. Gastric phase: Gastric acid secretion occurs in this phase. the
swallowed food activate the gastric activity by stretching the
stomach by gastric contents and stimulating receptors in the
stomach. Gastric secretion is stimulated by three chemicals, Ach,
histamine and gastrine. these chemicals stimulate parietal cells to
screte HCL and intrinsic factor.
3. Intestinal phase: In the intestinal phase, the duodenum responds
to chyme and moderates gastric activity through hormones and
nervous reflexes.
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