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Digestion in Mouth

Which digesti...

Question

Which digestive juice is secreted in the mouth? What enzyme does it contain and what is its function?

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Solution

Saliva is the digestive juice secreted by the salivary glands in the mouth. Saliva contains the enzyme amylase or ptyalin, which helps in the breakdown of starch present in food into simple sugar.

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Which of the following digestive glands secretes a digestive juice which does not contain enzymes?

The stomach secretes gastric juice, which contains hydrochloric acid. What is its function ?

Q. In human pancreas secretes pancreatic juice. Match the pairs of enzyme and its function present in it.

Enzyme	Function
$(1)$ Amylase	(a) Digestion of fat
$(2)$ Trypsin	(b) Digestion of protein
$(3)$ Lipase	(c) Digestion of starch

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. Pancreatic juice does not contain enzyme to digest

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