What is peristalsis?

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Multiple Choice

What is peristalsis?

Peristalsis is the coordinated, wave-like contraction of the smooth muscle in the digestive tract that moves contents forward. In the muscularis externa, the circular muscle behind a bolus contracts while the longitudinal muscle ahead relaxes, creating a propulsive wave that travels along the tract. This sequencing, driven by the enteric nervous system, pushes material from one segment to the next—such as food down the esophagus or chyme through the intestines. It’s not about absorbing nutrients, nor about secreting bile, and it’s not random contractions; it’s a purposeful, directional movement of contents.

Peristalsis is the coordinated, wave-like contraction of the smooth muscle in the digestive tract that moves contents forward. In the muscularis externa, the circular muscle behind a bolus contracts while the longitudinal muscle ahead relaxes, creating a propulsive wave that travels along the tract. This sequencing, driven by the enteric nervous system, pushes material from one segment to the next—such as food down the esophagus or chyme through the intestines. It’s not about absorbing nutrients, nor about secreting bile, and it’s not random contractions; it’s a purposeful, directional movement of contents.

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