Give one word for the following:
(i) I am secreted from the walls of stomach.
I kill all the harmful germs present in food and help my friend pepsin to work in acidic medium.
(ii) We are the biocatalysts. We enhance the rate of metabolic activities.
(iii) We push the food forward by a rhythmic contraction.
(i) Hydrochloric acid ($HCl$)
(ii) Enzymes
(iii) Peristaltic movements