Question

even a hard solid food also becomes smooth slurry in the digestive system

Answer 1

Even a hard solid food also becomes smooth slurry in digestive system by the enzymes released in a particular time.This mechanism is a amazing fact.
The food which we take inside our bitten by our teeth and made with the help of saliva secreted from salivary glands. The food mixed with saliva becomes smooth for the movement through food pipe.

Hope this helps..

Answer 2

 hard solid food also becomes smooth slurry in digestive system by the enzymes released in a particular time.The food mixed with saliva becomes smooth for the movement through food pipe.