Small Intestine


 
 
Concept Explanation
 

Small Intestine

Small intestine: It is about 6 metre in length and 2.5 cm in thickness. There are three divisions of the small intestine: ‘duodenum’, ‘jejunum’ and ‘ileum’. Duodenum is the first part. It begins from the pyloric stomach and is C shaped. In the middle of the duodenum two different ducts open through a common aperture. One of the ducts is the common bile duct and the other is pancreatic duct. ‘Bile’ is a yellowish green alkaline juice is poured into the duodenum through the common bile duct.

Layers of small intestine: The small intestine is formed of four layers. The inner layer of intestine contains a large number of small finger like projections named as villi which helps in absorption.From inside to outside layers are mucosa, submucosa,muscularis and serosa.

                                                   

Functions:

  • Digestion and Absorption of food material takes place in small intestine.
  • Different kind of secretions reaching the small intestine helps in digestion of different types of nutrients.These secretions are from liver(bile juice), intestinal juice etc.
  • It contains a large number of projections called villi , helps in increasing surface area and results in more absorption of digested food.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Which part of alimentary canal receives bile from the liver?

    Right Option : B
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    Explanation
    Question : 2

    The process of digestion in the alimentary canal gets completed in the ______________. 

    Right Option : C
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    Explanation
    Question : 3

    __________________ secretes the bile juice.

    Right Option : A
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    Explanation
     
     
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