When does the gastric phase begin?

When does the gastric phase begin?

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.

What are the phases of gastric acid 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 is phase of gastric secretion that is stimulated by the presence of food in the stomach?

Gastric secretion is stimulated by the act of eating (cephalic phase) and the arrival of food in the stomach (gastric phase). Arrival of the food in the intestine also controls gastric secretion (intestinal phase). The secreted fluid contains hydrochloric acid, pepsinogen, intrinsic factor, bicarbonate, and mucus.

How is gastric activity activated?

Ingested food stimulates gastric activity in two ways: by stretching the stomach and by raising the pH of its contents. Stretching activates two reflexes: a short reflex is mediated through the myenteric nerve plexus; and a long reflex is mediated through the vagus nerves and brainstem.

What happens in the intestinal phase?

The intestinal phase is a stage in which the duodenum responds to arriving chyme and moderates gastric activity through hormones and nervous reflexes. The duodenum initially enhances gastric secretion, but soon inhibits it.

Which phase controls how fast the stomach empties?

intestinal phase
The intestinal phase controls the rate of gastric emptying and the release of hormones needed to digest chyme in the small intestine.

What happens during the gastric phase of the digestive system?

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.

When does the cephalic phase of gastric secretion begin?

Begins when you see, smell, taste, or think of food When does Cephalic (reflex) phase begin? Directed by CNS through the vagus nerve (PSN) what is the Cephalic phase directed by?

How to study chapter 23 of gastric secretion?

Start studying Chapter 23 – Phases of Gastric Secretion. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search Browse Create Log inSign up

Where does the gastric juice go when it enters the stomach?

The gastric glands secrete gastric juice. When food enters the stomach, the stomach stretches and activates stretch receptors. The stretch receptors send a message to the medulla and then back to the stomach via the vagus nerve.