Movements Of Small Intestine

Movements Of Small Intestine

Describe the small intestine movements.
Answer:

Movements of small intestine:

1. Mixing movements:

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1. Segmentation movements.
   • These movements occurs in rhythmic fashion.
   • Segmental contractions occur at regularly spaced intervals along a section of intestine.
   • The segments of intestine in between the constricted segments are relaxed.
   • This results in ring appearance resembling the chain of sausages.
   • The constricted part later relaxes and relaxed part constricts.
   • This process is repeated over and over again aids in mixing of chyme with digestive juices.
   • Pendular movement.
   • Loops of intestine sweep forward and backward or upward and downward resembling the movements of pendulum in the clock.
   • This facilitates mixing of bolus with the digestive enzymes.

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2. Propulsive movements:

1. Peristaltic movement.
   • Peristalsis is a coordinated reaction in by a wave of relaxation passes down a hollow viscus.
   • These waves propel the intestinal contents towards ileo-caecal vale.
   • The peristaltic contractions are always weak and usually disappear after travelling for few centimetres.
   • So the chyme requires several hours to travel from duodenum to the end of small intestine.
   • The peristaltic wave increases to a great extend immediately after a meal.
2. Peristaltic rush.
   • It occurs due to excessive irritation of intestinal mucosa or extreme distention of the intestine.
   • This peristaltic rush sweeps the contents of intestine into the colon with few minutes.

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3. Peristalsis in fasting – migrating motor complex:

• It occurs during the long periods of fasting.
• It occurs once in every 1/2 to 2 hours.
• The migrating motor complex sweeps the excess digestive secretions into the colon and prevents the accumulation of the secretions in stomach and intestine.

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4. Movements of villi:

• The movements of villi are shortening and elongation which helps in emptying lymph from the central lacteal into the lymphatic system.
• The surface area of villi is increased during elongation which aids in absorption of digested food particles from the lumen of intestine.