Which one of the following is the correct order of peristalsis in human digestive system ?
Which one of the following is the correct order of peristalsis in human digestive system ?
A) Grinding → Propulsion → Retropulsion
B) Retropulsion → Grinding → Propulsion
C) Propulsion → Retropulsion → Grinding
D) Propulsion → Grinding → Retropulsion
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