When a person puts food in his mouth, then teeth cut it into small pieces, chew 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 enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is and enzyme for digestion. The partially digested food then enters into small intestine for further digestion.
- What is Gland A, Substance B and Enzyme C?
- Name the tube D.
- What is the movement E known as?
- What are F, G and H?
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- Gland A is salivary gland.
- Substance B is saliva.
- Enzyme C is salivary amylase.
- Tube D is oesophagus.
- The movement E is known as peristaltic movement.
- (i) F is hydrochloric acid, G is mucus and H is pepsin.
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