Complete the following flow chart as per the given instructions :"

a: Pepsin

b: HCl (Hydrochloric Acid)

c: Mucus

d: The main function of pepsin is to digest proteins

e: The main function of HCl is to create an acidic environment, kill microbes and activate inactive pepsinogen into an active form.

f: Mucus protects the wall of the stomach from the acidic effect of acid.