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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
Fill in the blank and rewrite the completed statement:
.................... is the largest gland in the body.
Describe one way in which the small intestine is adapted for the absorption of digested food.
The partially digested food coming from the stomach of a person enters a long and narrow organ A in his body. The organ A receives the secretion of two glands : liver and pancreas. Liver secretes a greenish-yellow liquid B which is normally stored in the organ C. Pancreas secretes pancreatic juice which contains three digestive enzymes D, E and F. The intestinal juice completes the process of digestion of food. The inner wall of organ A has millions of tiny finger-like projections G which help in the rapid absorption of digested food into blood stream. The undigested part of food then passes into wider tube H which absorbs most of the water from undigested food. The last part of tube H called I stores this undigested food (or waste) for some time. The undigested food is then passed out though opening J as faeces in the process known as K.
(a) Name the organ A.
(b) Name (i) liquid B, and (ii) organ C.
(c) What are the digestive enzymes D, E and F?
(d) Name the projections G present on the inner wall of organ A.
(e) Name (i) tube H (ii) part I (iii) opening J, and (iv) process K.
Define the following term:
Peristalsis
Write one function each of the following enzymes:
Pepsin
Fill in the blank.
The teeth called ______ are a total of four in number on the sides of incisors
State the four ways in which saliva is useful to us.
Write true or false for the below statement. Rewrite the false statements correctly.
Digestion of food in the intestine takes place in the presence of dilute hydrochloric acid.
Write true or false for the below statement. Rewrite the false statements correctly.
The removal of faeces through the anus is called excretion.
Put the following processes in their correct sequence of occurrence during digestion.
peristalsis; tongue pushes the food; grinding and mixing saliva; cutting and tearing of food
Answer in detail.
What is meant by digestion? How does it differ from nutrition?
The question has four options. Choose the correct answer:
Monophyodont teeth occur in
Who is telling a lie?
Appendix: Digestion is impossible without me.
A group of organs together make up an ______ system.
Throughout the length of the alimentary canal the layer which shows the presence of goblet cells is ______
A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains:
Cud is the name given to the food of ruminants which is ______.
What is chyme?
What is a vermiform appendix?
Mucosa forms __a__ in stomach and ___b___ in intestine respectively.
