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pH in Digestive System

The stomach w...

Question

The stomach wall secretes gastric juice containing three substances 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.

(b) Name the tube D.

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Solution

The tube D is the oesophagus.

The slightly digested food from the mouth goes down the oesophagus (tube D).

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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?

Q. The functions of the organs of digestion are listed below. Write the name of one organ from the lost against each phrase stomach, liver, small intestine, oesophagus, mouth, large intestine.
(a) no digestion takes place here _________________
(b) food is partly digested here in an acidic medium ________________
(c) digest and also absorbs food _______________
(d) takes food from the mouth to the stomach _______________
(e) starch is partly digested here ________________
(f) produces bile __________________

Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Rumen in cow is actually the true stomach. ( )
2. Digestion of food starts in the mouth. ( )
3. Gastric juice is secreted by the small intestine. ( )
4. An enzyme called ptyalin is present in saliva. ( )
5. Villi helps in digestion of food. ( )

Q. The stomach wall secretes gastric juice containing three substances 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?

Q. Question 5
The acid present in the stomach

(a) Kills the harmful bacteria that may enter along with the food.
(b) Protects the stomach lining from harmful substances.
(c) Digests starch into simpler sugars.
(d) Makes the medium alkaline.

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