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प्रश्न
Describe the process of digestion of protein in stomach.
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उत्तर १
The gastric glands of the stomach secrete gastric juice that contains HCl and proenzymes – pepsinogen and prorennin. The proenzyme pepsinogen, on exposure to HCl gets converted into the active enzyme pepsin, the proteolytic enzyme of stomach. The pepsin converts proteins into proteoses and peptones (peptides). Prorennin is found in gastric juice of infants and is activated by pepsin into active rennin. It helps in digestion of milk protein casein.
उत्तर २
The digestion of proteins begins in the stomach and is completed in the small intestine. The digestive juice secreted in the gastric glands present on the stomach walls is called gastric juice. The food that enters the stomach becomes acidic on mixing with this gastric juice.
The main components of gastric juice are hydrochloric acid, pepsinogen, mucus, and rennin. Hydrochloric acid dissolves the bits of food and creates an acidic medium so that pepsinogen is converted into pepsin. Pepsin is a protein- digesting enzyme. It is secreted in its inactive form called pepsinogen, which then gets activated by hydrochloric acid. The activated pepsin then converts proteins into proteases and peptides
Rennin is a proteolytic enzyme, released in an inactive form called prorennin. Rennin plays an important role in the coagulation of milk.
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?
Answer briefly:
How does bile help in the digestion of fats?
Describe the digestive role of chymotrypsin. What two other digestive enzymes of the same category are secreted by its source gland?
What would happen if HCl were not secreted in the stomach?
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?
Name the enzymes involved in the breakdown of nucleotides into sugars and bases?
Define digestion in one sentence.
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)
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 is the intestinal mucosa protected from the acidic food entering from stomach?
How are the activities of gastro-intestinal tract regulated?
