Advertisements
Advertisements
प्रश्न
Describe the digestion of starch.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Carbohydrates are bodybuilding nutrients.
Define holozoic nutrition. Give one example
The process of digestion of food in humans begins in:
(a) stomach
(b) food pipe
(c) mouth
(d) small intestine
When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is and enzyme for digestion. The partially digested food then enters into small intestine for further digestion.
(a) What is (i) gland A (ii) substance B, and (iii) enzyme C?
(b) Name the tube D.
(c) What is the movement E known as?
(d) What are (i) F (ii) G, and (iii) H?
Where does digestion of fat take place in our body?
Pylorus is an opening from
Consider the following two statements A and B and select the right option from (i)-(iv) about their correctness.
- Small intestine is shorter than large intestine.
- Small intestine is wider than large intestine.
Options :
(i)Both the statements are correct
(ii) Both the statements are wrong
(iii) Statement A is correct, B is wrong
(iv) Statement B is correct, A is wrong
Why is the small intestine the most important organ of the digestive system?
Study the diagram given below and then answer the question that follows:
Give the total number of the type of tooth mentioned in '1' above, in the mouth of an adult and state its function.
Complete the following table by filling in the blanks 1 to 8.
|
Organ |
Enzyme |
Food acted upon |
Find product |
|
1 |
Pepsin |
2 |
3 |
| Mouth | 4 | 5 | Disaccharide |
|
6 |
7 |
Maltose |
8 |
The teeth called canines are a total of four in number on the sides of ______.
What is the main function of bile?
How is the small intestine best suited for the digestion and absorption of food?
Describe the process of digestion in human beings.
The question has four options. Choose the correct answer:
Stomach in vertebrates is the chief site of digestion of
The question has four options. Choose the correct answer:
Teeth present in the upper molar of human beings are
Write down the explanation.
Explain the structure of tooth.
Breakdown of food into smaller molecules in our body is known as
Select the correct pair of peptide hormones secreted by the alimentary canal.
Liver transports nutrients, oxygen, wastes, and hormones.
