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प्रश्न
Observe the diagram. This is the histological structure of the stomach. Identify and comment on the significance of the layer marked by an arrow.
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उत्तर
The layer marked in the diagram represents glandular epithelium of mucosa.
Significance of the glandular epithelium of mucosa:
Goblet cells of the epithelial layer of a mucous membrane secrete mucus which lubricates the lumen of the alimentary canal. This helps in movement of food through the gastrointestinal tract.
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संबंधित प्रश्न
Label the following figure of the digestive system.
A part of the human digestive system
What is the name of tiny projections on the inner surface of small intestine which help in absorbing the digested food?
Define holozoic nutrition.
What substances are contained in pancreatic juice? What are their functions?
The process of digestion in humans is completed in:
(a) oesophagus
(b) small intestine
(c) stomach
(d) large intestine
The inner lining of stomach is protected by one of the following from the harmful effect of hydrochloric acid. This is:
(a) pepsin
(b) mucus
(c) saliva
(d) bile
What are the main characteristics of enzyme?
Define the following term:
Kilocalorie
Give two reasons to explain why the absorption of digested food occurs mainly in the small intestine.
Last molar tooth in human beings is called ______.
Fill in the blank.
The human teeth appear in two sets, the first set is called primary which consists of only _______ teeth
Name the following
The organ into which the pancreatic juice and the bile juice are poured
Fill in the blanks in the table (1-5) by selecting the suitable names of substances from the list given below:
(steapsin, peptones, fatty acids, proteoses, protein).
| Digestive Enzymes | Acts on | To convert into |
| (i) Pepsin | _________(2) | ________(3) and |
| (ii) _______(1) | Fats |
________(4) _________(5) |
Define the term nutrition.
Find the odd one out. Give reasons for your choice
Differentiate between
Digestion and Absorption
Differentiate between.
Mechanical digestion and Chemical digestion
The question has four options. Choose the correct answer:
Uvula can close the opening of
The question has four options. Choose the correct answer:
The ileum is characterized by
The question has four options. Choose the correct answer:
Trypsin is connected with the digestion of
The question has four options. Choose the correct answer:
The number of teeth that grow only once in human is
Who is telling a lie?
Lung: I play an important role in excretion.
How do we know that we are hungry and that we should now eat?
State whether true or false. If false, correct the statement.
During digestion, proteins are broken down into amino acids.
Identify the salivary gland lying below the tongue.
What happens when we swallow our food?
Draw the diagram of the alimentary canal of man and label the following parts. Mouth, Oesophagus, Stomach, Intestine.
Read the following passage carefully and answer the questions that follow it.
| Bile juice is stored in a sac called, gall bladder, located near its organ of secretion, liver. The gall bladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released from the pancreas. |
- Which organ secretes the bile juice?
- Why is digestion of fats difficult as compared to that of other nutrients?
- How does bile juice help in the digestion of fat?
- Where is the digestion of fat completed?
- Does bile juice digest fat completely?
What are the end products of digestion of starch, proteins, and fats respectively?
Rearrange the jumbled sequence of the different parts of the alimentary canal in proper sequence, (esophagus, small intestine, stomach, large intestine, anus, mouth, rectum)
