Draw neat diagram showing the peristalic movement in oesophagus

draw neat diagram showing the peristalic movement in oesophagus
A.
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  1. The walls of the food pipe secrete a slippery substance called mucus.
  2. Mucus lubricates and protects the oesophageal walls from damage.
  3. This helps the food bolus to slide down easily into the stomach through oesophagus.