The series of wavelike contractions of the smooth muscles in a single direction is known as peristalsis
What is peristalsis?
- Muscles contract and relax in a radially symmetrical pattern during peristalsis, which travels anterogradely down a tube like a wave.
- The process of synchronized involuntary circular muscle contraction known as peristalsis is initiated by the simultaneous contraction of the longitudinal muscle and relaxation of the circular muscle in the stomach lining.
- The human gastrointestinal tract is an example of a digestive tract where smooth muscle tissue contracts sequentially to create a peristaltic wave, which drives a ball of food (referred to as a bolus before being converted into chyme in the stomach) along the tract.
- Circular smooth muscles relax first, then contract behind the chewed material to prevent it from traveling backward, and finally, longitudinal smooth muscles contract to push.
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