State the significance/importance of the following:
$(1)$ Ptyalin
$(2)$ Renin

(N/A) $(1)$ Ptyalin (Salivary Amylase) is an enzyme present in saliva. It initiates the chemical digestion of carbohydrates by partially breaking down starch into maltose.
$(2)$ Renin is a proteolytic enzyme found in the gastric juice of infants. It plays a crucial role in the digestion of milk proteins by converting the soluble milk protein caseinogen into insoluble casein (curd),which is then further digested by pepsin.