Question

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

Answer 1

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.