During peristalsis, doorlike mechanisms called valves or sphincter muscles perform all of the following functions except one. Which one is the exception?

Question

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Valves or sphincter muscles within the alimentary tract are strictly involved in mechanical aspects of digestion and do not synthesize dietary enzymes. An example of valvular peristaltic action is the small amounts of chyme that are released from the stomach through the pyloric sphincter to allow for adequate digestion and absorption in the small intestine. Regulation of these valves is complex, involving muscular function and different pressures on each side of the valve.

During Peristalsis, Doorlike Mechanisms Called Valves or Sphincter Muscles Perform