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Increased pressure within the rectum acts as stimulus for defecation. [1] [3] Small intestine motility is also increased in response to the gastrocolic reflex. [2] These contractions are generated by the muscularis externa stimulated by the myenteric plexus. [1] A number of neuropeptides have been proposed as mediators of the gastrocolic reflex.
Defecation (or defaecation) follows digestion, and is a necessary process by which organisms eliminate a solid, semisolid, or liquid waste material known as feces from the digestive tract via the anus or cloaca.
The gastroileal reflex is stimulated by the presence of food in the stomach and gastric peristalsis. Initiation of the reflex causes peristalsis in the ileum and the opening of the ileocecal valve (which allows the emptying of the ileal contents into the large intestine, or colon). [ 1 ]
The parasympathetic system is responsible for stimulation of "rest-and-digest" or "feed-and-breed" [3] activities that occur when the body is at rest, especially after eating, including sexual arousal, salivation, lacrimation (tears), urination, digestion, and defecation.
The enterogastric reflex is stimulated by duodenal distension. [2] It can also be stimulated by a pH of 3-4 in the duodenum and by a pH of 1.5 in the stomach. Upon initiation of the reflex, the release of gastrin by G-cells in the antrum of the stomach is shut off.
A peptide hormone, gastrin, produced by G cells in the gastric glands, stimulates the production of gastric juice which activates the digestive enzymes. Pepsinogen is a precursor enzyme produced by the gastric chief cells, and gastric acid activates this to the enzyme pepsin which begins the digestion of proteins. As these two chemicals would ...
Heather Finley, a registered dietitian, adds, "This this technique might help relieve constipation because it could be stimulating acupressure points that stimulate the colon, but there is no ...
Secretion of gastrin is stimulated by food arriving in stomach. The secretion is inhibited by low pH. Secretin – is in the duodenum and signals the secretion of sodium bicarbonate in the pancreas and it stimulates the bile secretion in the liver. This hormone responds to the acidity of the chyme.