Question

state role of following in human digestive system (1) Digestive enzymes (2)HCL(3)Villi

Answer 1

villi is responsible for absorption of nutrients directly into blood.
The work of the HCL in our stomach is to digest the food.
Then it moves to the small intestine where enzymes are secreted to digest proteins, starches and sugars, and lipases to digest fats. ... There are different digestive enzymes for different molecules: Proteases will break down protein into amino acids.

Answer 2

Hydrochloric acid is secreted by the sub mucosal epithelium of stomach and make the medium acidic for gastric enzyme action on the chyme it also activated pepsinogen into pepsin . villi is a finger like projection of mucosal epithelium of small intestine and increase the absorptive surface area of digested food