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Absorption & Assimilation in Small Intestine

What is absor...

Question

What is absorption?

A

Food entering the mouth and being chewed.

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B

Food entering the stomach for digestion.

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C

Taking digested food into the blood stream

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D

Making complex organic molecules in cells using digested foods.

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Solution

The correct option is C Taking digested food into the blood stream
The process of digestion completes in the small intestine. The nutrients present in the food enters into the blood through the villi. This process is called absorption.

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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 __________________

The process of digestion of food in humans begins in :
(a) stomach (b) food pipe (c) mouth (d) small intestine

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

Q. The digested food enters the blood vessels present in villi.

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