What are the 3 phases of gastric secretions?

The physiologic stimulation of acid secretion has classically been divided into three interrelated phases: cephalic, gastric, and intestinal [6]. The cephalic phase is activated by the thought, taste, smell, and sight of food, and swallowing. It is mediated mostly by cholinergic/vagal mechanisms.

What are the three phases of gastric activity quizlet?

Cephalic phase, Gastric phase, Intestinal phase.

Which phase of gastric secretion is stimulated by the distention of the stomach quizlet?

-Distention of the stomach activates a parasympathetic reflex.

What are the different phases of gastric juice secretion?

Gastric secretion occurs in three phases: cephalic, gastric, and intestinal. During each phase, the secretion of gastric juice can be stimulated or inhibited. The cephalic phase (reflex phase) of gastric secretion, which is relatively brief, takes place before food enters the stomach.

What are gastric phases?

The gastric phase is a period in which swallowed food and semi-digested protein ( peptides and amino acids ) activate gastric activity. About two-thirds of gastric secretion occurs during this phase. Ingested food stimulates gastric activity in two ways: by stretching the stomach and by raising the pH of its contents.

What happens during the cephalic phase of gastric secretion?

During the cephalic phase, gastric acid and pepsinogen secretion is activated by the thought, sight or smell of food, and by food in the mouth. The mechanisms of control of gastric secretion during the cephalic phase are summarized in Figure 4.11. Emotions also influence gastric secretion.

What are the 5 phases of digestion?

Figure 2: The digestive processes are ingestion, propulsion, mechanical digestion, chemical digestion, absorption, and defecation. Some chemical digestion occurs in the mouth.

What are the 10 digestive hormones?

The GI hormones that regulate gut mucosal growth positively or negatively include gastrin, CCK, secretin, somatostatin, ghrelin, bombesin, and gastrin-releasing peptide (GRP).

Can you digest your own stomach?

How does it avoid digesting itself? THE STOMACH does not digest itself because it is lined with epithial cells, which produce mucus. This forms a barrier between the lining of the stomach and the contents.

What are the three phases of gastric secretion?

Gastric secretion means secretion of digestive juice by the stomach, there are three phases of gastric secretion – Cephalic, Gastric and Intestinal phase.

How is the secretion of gastric acid regulated?

Regulation of secretion of the stomach is of three phases they are: Cephalic phase, Gastric phase and Intestinal phase. This gastric secretion phase happens just before food enters the stomach, and this phase prepares the body for eating and digestion.

Which is part of the digestive system secretes gastric juice?

Gastric secretion. The cephalic phase of gastric secretion occurs in response to stimuli received by the senses—that is, taste, smell, sight, and sound. This phase of gastric secretion is entirely reflex in origin and is mediated by the vagus (10th cranial) nerve. Gastric juice is secreted in response to vagal stimulation,…

What are the three chemicals that stimulate gastric secretion?

Gastric secretion is stimulated chiefly by three chemicals: Acetylcholine (ACh). This is secreted by the parasympathetic nerve fibers of both the short and long reflex pathways. Histamine. This is a paracrine secretion from the enteroendocrine cells in the gastric glands. Gastrin.