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How is the intestinal mucosa protected from the acidic food entering from stomach?

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प्रश्न

How is the intestinal mucosa protected from the acidic food entering from stomach?

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उत्तर

The mucus and bicarbonates present in gastric juice play an important role in lubrication and protection of the mucosal epithelium from excoriation by highly concentrated hydrochloric acid.

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पाठ 16: Digestion and Absorption - Exercises [पृष्ठ ९४]

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एनसीईआरटी एक्झांप्लर Biology Exemplar [English] Class 11
पाठ 16 Digestion and Absorption
Exercises | Q 7. | पृष्ठ ९४

संबंधित प्रश्‍न

Match column I with column II

  Column I   Column II
a Bilirubin and biliverdin 1 Parotid
b Hydrolysis of starch 2 Bile
c Digestion of fat 3 Lipases
d Salivary gland 4 Amylases

Describe the process of digestion of protein in stomach.


Bile juice contains no digestive enzymes, yet it is important for digestion. Why?


How are polysaccharides and disaccharides digested?


What would happen if HCl were not secreted in the stomach?


How does butter in your food gets digested and absorbed in the body?


Mark the right statement among the following


Trypsinogen is an inactive enzyme of pancreatic juice. An enzyme, enterokinase, activates it. Which tissue/ cells secrete this enzyme?/ How is it activated?


Name the enzymes involved in the breakdown of nucleotides into sugars and bases?


Correct the following statement by deleting one of entries (given in bold).

Goblet cells are located in the intestinal mucosal epithelium and secrete chymotrypsin/mucus.


Name the part of the alimentary canal where major absorption of digested food takes place. What are the absorbed forms of different kinds of food materials?


Correct the statement given below by the right option shown in the bracket against them.

Rennin is a proteolytic enzyme found in gastric juice in (infants/adults).


Correct the statement given below by the right option shown in the bracket against them.

Dipeptides, disaccharides and glycerides are broken down into simple substances in region of small intestine. (jejunum/duodenum)


How are the activities of gastro-intestinal tract regulated?


Describe the enzymatic action on fats in the duodenum.


A person had roti and dal for his lunch. Trace the changes in those during its passage through the alimentary canal.


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