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प्रश्न
Write names of different parts of human digestive system and explain functions of any three parts.
उत्तर
(1) The digestive system of human beings consists of an alimentary canal and the associated digestive glands.
Alimentary canal: The human alimentary canal begins with the mouth and ends in the anus. It is a long muscular tube of varying diameter consisting of oesophagus, stomach, small intestine and large intestine. Associated digestive glands: The digestive glands associated with the alimentary canal are salivary glands and gastric glands.
(1) Mouth: In the mouth, there are teeth which masticate the food and convert the larger particles of food into smaller ones. The tongue helps in tasting the food and rolling it into a soft ball. There are salivary glands in the mouth which secrete saliva.
(2) Oesophagus: The oesophagus is a narrow tube carrying food to the stomach. Due to peristalsis, the food is pushed forward in the alimentary canal.
(3) Stomach: The stomach is a J-shaped muscular organ situated on the left side of the abdomen. Muscles of the stomach also undergo peristalsis and push the food forward. In the stomach, the food is mixed thoroughly with the gastric juice secreted by the gastric glands present in the stomach wall. There is a sphincter muscle at the lower end of the stomach. This sphincter muscle releases the partially digested food into the small intestine.
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संबंधित प्रश्न
The inner wall of the small intestine has many finger-like outgrowths called ______.
The tongue helps in mixing food with saliva.
What substances are contained in gastric juice? What are their functions?
What is the role of hydrochloric acid in our stomach?
Name the main organs of the human digestive system. Also name the associated glands.
The length of small intestine in a human adult is about:
(a) 4.5 m
(b) 1.5 m
(c) 3.5 m
(d) 6.5 m
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.
Write four sequential steps of the procedure of the experiment "Preparing a temporary mount of a leaf peel to show stomata".
Last molar tooth in human beings is called ______.
Fill in the blank.
In an adult human, there are a total of ___ teeth.
Define the following term:
assimilation
Fill in the blanks.
Removal of undigested food is called ________.
Complete the following enzymatic reaction.
Maltose \[\ce{->[maltase]}\] ___________
Mention the different types of nutrition?
State whether the following statements are True or false: Pancreatic amylase digests protein into amino acids.
Correct the spellings: Pespin
The question has four options. Choose the correct answer:
Uvula can close the opening of
Throughout the length of the alimentary canal the layer which shows the presence of goblet cells is ______
The exit of unabsorbed food material is regulated by ____________.
Read carefully the terms given below. Which of the following set is the correct combination of organs that do not carry out any digestive functions?
