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प्रश्न
Give a reason.
Food becomes acidic in the stomach.
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उत्तर
Food becomes acidic in the stomach because of the presence of hydrochloric acid. As the food reaches the stomach, it gets mixed with the hydrochloric acid present there. The hydrochloric acid plays the following roles in digestion:
- It initiates protein digestion by activating the conversion of pepsinogen to pepsin.
- It provides an acidic medium for the activity of pepsin and other enzymes present in gastric juice.
संबंधित प्रश्न
The tongue helps in mixing food with saliva.
Which part of the digestive canal is involved in:
Killing of bacteria ______.
Label the following figure of the digestive system.
A part of the human digestive system
What is the role of hydrochloric acid in our stomach?
What is the function of enzymes in the human digestive system?
| 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?
Define the following term :
Pylorus
Fill in the blanks.
Incisors are used for _____ and _____ the food.
What is the role of the liver and the pancreas respectively in the digestion of food?
Differentiate between
Digestion and Absorption
The question has four options. Choose the correct answer:
The vermiform appendix is a constituent of
Who is telling a lie?
Tongue: My taste-buds can tell only a sweet taste.
Name the salivary glands in our mouth?
List out the functions of the digestive system.
The contraction and expansion movement of the walls of the food pipe is called ____________.
Salivary glands secrete ______.
Name the organism which lives in the digestive system of human ______.
In which of the following groups of organisms, food material is broken down outside the body and absorbed?
What is the significance of the emulsification of fats?
