It is this ’sweeping’ of the small intestine that is responsible for the rumbling felt or heard between meals A small amount of bile and enzymes are released with each MMC and these secretions may also help clean out the small intestine of bacteria build-up. These waves occur in cycles, playing a housekeeping role, clearing the small intestine of remnants of food and bacteria left behind during peristalsis and segmentation contraction. Regulation of the MMC is complex, requiring the release of many hormones and neurotransmitters, as well as the activity of the enteric and autonomic nervous systems.2 This contraction moves through the stomach and small intestine, towards the ileocaecal valve.
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