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प्रश्न
Describe the digestion of starch.
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उत्तर
Digestion of starch:
(a) Digestion of starch in the oral cavity: Food is mixed with saliva and salivary amylase or ptyalin converts starch into maltose, isomaltose, and limit dextrins.
Starch \[\ce{->[Salivary][Amlylase]}\] Maltose + Isomaltose + Limit dextrin.
(b) Digestion of starch in the stomach: Gastric juice does not contain carbohydrate digestive enzyme, hence no digestion of starch takes place in the stomach.
(c) Digestion of starch in the small intestine: 40% starch is partially digested by ptyalin while the remaining 60% starch is digested by pancreatic amylase.
Starch \[\ce{->[Pancreatic][Amlylase + Cl-]}\] Maltose + Isomaltose + Limit dextrin.
The enzymes of intestinal juice act as below:
Maltose \[\ce{->[Maltase]}\] 2 Glucose
Isomaltose \[\ce{->[Isomaltase]}\] 2 Glucose
Surcrose \[\ce{->[Sucrase]}\] Glucose + Fructose
Lactose \[\ce{->[Lactase]}\] Glucose + Galactonse
Limit Dextrin \[\ce{->[Limit][Dextrinase]}\] Glucose
The humans cannot digest the cellulose due to the absence of cellulose enzyme.
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संबंधित प्रश्न
Fill in the blank and rewrite the completed statement:
.................... is the largest gland in the body.
Digestion of starch starts in the stomach.
Match the items of Column I with suitable items in Column II.
| Column I | Column II | ||
| (a) | Salivary gland | (i) | Bile juice secretion |
| (b) | Stomach | (ii) | Storage of undigested food |
| (c) | Liver | (iii) | Saliva secretion |
| (d) | Rectum | (iv) | Acid release |
| (e) | Small intestine | (v) | Digestion is completed |
| (f) | Large intestine | (vi) | Absorption of water |
| (vii) | Release of faeces |
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