Introduction to the Digestive System of the Human Body

Peristalsis is a wave-like movement (motion) that progresses along some of the hollow tubes of the body that have circular and longitudinal muscles, such as the intestines.

Peristalsis happens involuntarily and is induced by distension of the walls of the tube.

How does it work ?

  1. Immediately behind the distension the circular muscle contracts.
  2. In front of the distension the circular muscle relaxes, and
  3. the longitudinal muscle contracts
    ... which pushes forward the contents of the tube.

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