Question

what makes the movement of the food bolus in the oesophagus easy?

Answer 1

Heya,

The rthythmic contraction and relaxation movements of the wall of oesophagus is called peristaltic movement, which makes the movement of food bolus in the oesophagus easier. And as the saliva is mixed in the chewed food that helps in lubrication and also helps in easier movement of food.
Oesophagus also secrets mucus for lubrication of food.

Hope this helps....:)