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प्रश्न
Give any four reasons why water is necessary in our body.
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उत्तर
Importance of water in our body:
- Water is the major component of blood, which carries nutrients and oxygen, to and from all the cells.
- It is the major component of saliva and mucous, which lubricate the membranes that line our digestive system beginning with the mouth.
- It helps in regulating the temperature of the body.
- Water is very essential for digestion as well as absorption of food.
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संबंधित प्रश्न
Where is digested food absorbed into blood in human body?
Which of the following component of our food is digested by an enzyme which is present in saliva as well as in pancreatic juice?
| The partially digested food coming from the stomach of a person enters a long and narrow organ A in his body. The organ A receives the secretion of two glands : liver and pancreas. Liver secretes a greenish-yellow liquid B which is normally stored in the organ C. Pancreas secretes pancreatic juice which contains three digestive enzymes D, E and F. The intestinal juice completes the process of digestion of food. The inner wall of organ A has millions of tiny finger-like projections G which help in the rapid absorption of digested food into blood stream. The undigested part of food then passes into wider tube H which absorbs most of the water from undigested food. The last part of tube H called I stores this undigested food (or waste) for some time. The undigested food is then passed out though opening J as faeces in the process known as K. |
- Name the organ A.
- Name (i) liquid B, and (ii) organ C.
- What are the digestive enzymes D, E and F?
- Name the projections G present on the inner wall of organ A.
- Name (i) tube H (ii) part I (iii) opening J, and (iv) process K.
Write the function of the following in the human alimentary canal:
Villi
Write one function each of the following enzymes:
Pepsin
Write true or false for the below statement. Rewrite the false statements correctly.
The process of taking in food is called assimilation
Write true or false for the below statement. Rewrite the false statements correctly.
Absorption of food takes place in small intestine
Find the odd one out. Give reasons for your choice
Give reasons for the following:
All teeth in the mouth are not alike.
What is dental plaque?
Describe the human salivary gland.
Match items in column A with the appropriate items in Column B:
| Column A | Column B | ||
| 1 | HCl | a | Lactose |
| 2 | Rennin | b | Pellagra |
| 3 | Enteropeptidase | c | Rumen |
| 4 | Cellulose | d | Pepsin |
| 5 | Ptyalin | e | Starch |
| 6 | Vitamin | f | Pernicious anaemia |
| 7 | Intestinal juice | g | Trypsin |
| 8 | Bile salt | h | Casein |
| 9 | Vitamin A | i | Micelle |
| 10 | Goitre | j | Night-blindness |
| k | Iodine | ||
Who is telling a lie?
Liver: I am the largest gland in the body.
Sketch and label a diagram of the digestive system and describe it in your own words.
How do we know that we are hungry and that we should now eat?
What is the length of the alimentary canal?
Name the organism which lives in the digestive system of human ______.
What is digestion?
Cud is the name given to the food of ruminants which is ______.
What is chyme?
