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16 June, 22:46

Peristalsis in the alimentary canal is caused by the: A. contraction of muscle layers B. action of digestive enzymes C. stretching of the mucosa D. closing of the epiglottis

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  1. 16 June, 23:56
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    It occurs because of contraction of the muscle layers. There are two types of muscle found in the alimentary canal; longitudinal and circular muscle, the alternating contraction of these muscles forces the bolus of food through the digestive system.
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