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प्रश्न
Answer in detail.
What is meant by digestion? How does it differ from nutrition?
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उत्तर
The process of changing complex food into simple, absorbable form by the action of certain enzymes is called digestion. Many organs are associated with digestion. Digestion is of two types
1) Mechanical digestion
In mechanical digestion, food is broken down in the mouth when we chew it with our teeth.
2) Chemical digestion.
In chemical digestion, the food is digested by the actions of certain enzymes.
Digestion is necessary because the food which is obtained is in complex form and our body is not able to absorb nutrients from it. So it is converted into a simple absorbable form. Nutrition is the process of obtaining and using food by the organisms. It is different in different organisms. Ingestion, digestion, absorption, Assimilation, and egestion are the various steps involved in nutrition.
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संबंधित प्रश्न
How is the small intestine designed to absorb digested food?
What substances are contained in gastric juice? What are their functions?
Which part of alimentary canal receives bile from the liver?
| 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. |
- What are (i) gland A, (ii) substance B, and (iii) enzyme C?
- Name the tube D.
- What is the movement E known as?
- What are (i) F, (ii) G, and (iii) H?
Name the juice secreted by the liver.
Define with examples: Carnivores
Mark odd one in the series:
Name the enzymes secreted by the following: Pancreas
The question has four options. Choose the correct answer:
The liver performs the function of
Choose the odd one:
