When chyme penetrates a portion of the small intestine, distension of the intestinal wall induces localized concentric contractions spaced at intervals along the length of the intestine, how long does it take?

GASTROINTESTINAL PHYSIOLOGY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	less than 1 minute
B	1 minute
C	from 1 to 5 mountainous
D	15 to 30 minutes

Explanation:

Detailed explanation-1: -distended with chyme, stretching of the intestinal wall elicits localized concentric contractions spaced at intervals along the intestine and lasting a fraction of a minute. The contractions cause “segmentation” of the small intestine, as shown in figure below.

Detailed explanation-2: -This is because chyme from the stomach is typically hypertonic, and if large quantities were forced all at once into the small intestine, the resulting osmotic water loss from the blood into the intestinal lumen would result in potentially life-threatening low blood volume.

Detailed explanation-3: -Gastric emptying is regulated by both the stomach and the duodenum. The presence of chyme in the duodenum activates receptors that inhibit gastric secretion. This prevents additional chyme from being released by the stomach before the duodenum is ready to process it.

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