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Stomach and Oesophagus

After the par...

Question

After the partial digestion of food in mouth, it enters into ____ and reaches the stomach.

A

small intestine

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B

large intestine

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C

oesophagus

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D

trachea

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Solution

The correct option is C oesophagus
Digestion of food starts in the mouth. Teeth helps in breaking down large food particles into small fragments. These fragments are mixed with saliva and are converted into bolus. The bolus then enters the stomach through oesophagus by rhythmic contraction and relaxation of its muscular walls. This process is called peristalsis.

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Q. 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 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) H?

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