3 What is oesophagus? How many layers of muscles present in it ?
4 What is peristalsis ?
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The wall of the esophagus consists of four layers: mucosa, submucosa, muscularis propria, and adventitia.
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The muscular layer of the esophagus has two types of muscle. The upper third of the esophagus contains striated muscle, the lower third contains smooth muscle, and the middle third contains a mixture of both.
the involuntary constriction and relaxation of the muscles of the intestine or another canal, creating wave-like movements that push the contents of the canal forward.
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