What substance is mixed with food in the mouth during chewing by the teeth ?

What kills bacteria in our food in the mouth and stomach?

Name the watery substance released in our mouth during eating.

When a person puts food in his mouth, then teeth cut it into small pieces, shew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enters the stomach with food. The substance G protects the inside layer fo stomach from the damaging effect of substance F whereas substance H is an enzyme for digestion. The partially digested food then enters into small intestine for further digestion. (a) What is (i) gland A (ii) substance B, and (iii) enzyme C ? (b) Name the tube D. (c) What is the movement E known as ? (d) What are (i) F (ii) G, and (iii) D ?

What are the various types of secretions that are mixed with the food to facilitate the digestion of food in the intestine?

What substance enter into the food vacuole in Amoeba to break down the food?