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प्रश्न
What would happen if HCl were not secreted in the stomach?
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उत्तर १
Hydrochloric acid is secreted by the glands present on the stomach walls. It dissolves bits of food and creates an acidic medium. The acidic medium allows pepsinogen to be converted into pepsin. Pepsin plays an important role in the digestion of proteins. Therefore, if HCl were not secreted in the stomach, then pepsin would not be activated. This would affect protein digestion. A pH of about 1.8 is necessary for proteins to be digested. This pH is achieved by HCl.
उत्तर २
HCl is secreted by parietal or oxyntic cells of gastric glands. It serves the following functions:
- It activates the pepsinogen and prorennin into their active form pepsin and rennin.
- It provides the acidic pH (pH 1.8) optimal for pepsin.
- It kills the harmful bacteria present in the food.
- It stops the action of saliva on food. Pepsin and rennin are the principle proteolytic enzymes of stomach. If these enzymes are not activated by HCl then digestion of protein will not take place in stomach, and also the harmful bacteria can cause various diseases.
संबंधित प्रश्न
Choose the correct answer among the following:
Gastric juice contains
(i) pepsin, lipase and rennin
(ii) trypsin lipase and rennin
(iii) trypsin, pepsin and lipase
(iv) trypsin, pepsin and renin
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 |
How does pepsinogen change into its active form?
Describe the process of digestion of protein in stomach.
Describe the digestive role of chymotrypsin. What two other digestive enzymes of the same category are secreted by its source gland?
How are polysaccharides and disaccharides digested?
Emulsification of fats is brought about by ______.
Mark the right statement among the following
The food mixes thoroughly with the acidic gastric juice of the stomach by the churning movements of its muscular wall. What do we call the food then?
Trypsinogen is an inactive enzyme of pancreatic juice. An enzyme, enterokinase, activates it. Which tissue/ cells secrete this enzyme?/ How is it activated?
Define digestion in one sentence.
Correct the following statement by deleting one of entries (given in bold).
Fats are broken down into di- and monoglycerides with the help of amylase/ lipases.
Correct the following statement by deleting one of entries (given in bold).
Saliva contains enzymes that digest starch/protein.
Correct the statement given below by the right option shown in the bracket against them.
Pancreatic juice and bile are released through. (intestine- pancreatic/hepato-pancreatic duct)
How is the intestinal mucosa protected from the acidic food entering from stomach?
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.
