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    CH 16 Digestion and Absorption Part 3

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    fatehatun noor
    This document summarizes the digestion and absorption of carbohydrates, proteins, and fats according to Biology Class 11 NCERT Solutions: Chapter 16 Digestion and Absorption Part 3. It explains that carbohydrates are broken down into sugars by salivary amylase in the mouth and pancreatic and intestinal amylases and disaccharidases in the small intestine. It notes that without hydrochloric acid secretion in the stomach, protein digestion would be affected. It also describes how butter is emulsified and hydrolyzed into fatty acids and glycerol by bile salts and lipases in the small intestine before being absorbed into the bloodstream as chylomicrons.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    CH 16 Digestion and Absorption Part 3

    Uploaded by

    fatehatun noor
    48 views3 pages
    This document summarizes the digestion and absorption of carbohydrates, proteins, and fats according to Biology Class 11 NCERT Solutions: Chapter 16 Digestion and Absorption Part 3. It explains that carbohydrates are broken down into sugars by salivary amylase in the mouth and pancreatic and intestinal amylases and disaccharidases in the small intestine. It notes that without hydrochloric acid secretion in the stomach, protein digestion would be affected. It also describes how butter is emulsified and hydrolyzed into fatty acids and glycerol by bile salts and lipases in the small intestine before being absorbed into the bloodstream as chylomicrons.

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    fazlul

    Original Title

    Ch-16-Digestion-and-Absorption-Part-3

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    This document summarizes the digestion and absorption of carbohydrates, proteins, and fats according to Biology Class 11 NCERT Solutions: Chapter 16 Digestion and Absorption Part 3. It explains that carbohydrates are broken down into sugars by salivary amylase in the mouth and pancreatic and intestinal amylases and disaccharidases in the small intestine. It notes that without hydrochloric acid secretion in the stomach, protein digestion would be affected. It also describes how butter is emulsified and hydrolyzed into fatty acids and glycerol by bile salts and lipases in the small intestine before being absorbed into the bloodstream as chylomicrons.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    48 views3 pages

    CH 16 Digestion and Absorption Part 3

    Uploaded by

    fatehatun noor
    This document summarizes the digestion and absorption of carbohydrates, proteins, and fats according to Biology Class 11 NCERT Solutions: Chapter 16 Digestion and Absorption Part 3. It explains that carbohydrates are broken down into sugars by salivary amylase in the mouth and pancreatic and intestinal amylases and disaccharidases in the small intestine. It notes that without hydrochloric acid secretion in the stomach, protein digestion would be affected. It also describes how butter is emulsified and hydrolyzed into fatty acids and glycerol by bile salts and lipases in the small intestine before being absorbed into the bloodstream as chylomicrons.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    11/5/2019----Biology Class 11 NCERT Solutions: Chapter 16 Digestion and Absorption Part 3- Translation in Hindi, Kannada, Malayalam, Marathi,

    Punjabi, Sindhi, Sindhi, Tamil, Telgu - FlexiPrep----Downloaded from flexiprep.com

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    Biology Class 11 NCERT Solutions: Chapter 16 Digestion and


    Absorption Part 3
    Q: 9. How are polysaccharides and disaccharides digested?

    Answer

    The digestion of carbohydrates takes place in the mouth and the small intestine region of the
    alimentary canal. The enzymes that act on carbohydrates are collectively known as
    carbohydrases.

    Digestion in the mouth:

    As food enters the mouth, it gets mixed with saliva. Saliva - secreted by the salivary glands -
    contains a digestive enzyme called salivary amylase. This enzyme breaks down starch into sugar
    at .

    Digestion in the small intestine:

    Carbohydrate-digestion is resumed in the small intestine. Here, the food gets mixed with the
    pancreatic juice and the intestinal juice. Pancreatic juice contains the pancreatic amylase that
    hydrolyses the polysaccharides into disaccharides.

    Similarly, the intestinal juice contains a variety of enzymes (disaccharidases such as maltase,
    lactase, sucrose, etc.). These disaccharidases help in the digestion of disaccharides. The digestion
    of carbohydrates is completed in the small intestine.

    1 of 3
    11/5/2019----Biology Class 11 NCERT Solutions: Chapter 16 Digestion and Absorption Part 3- Translation in Hindi, Kannada, Malayalam, Marathi,
    Punjabi, Sindhi, Sindhi, Tamil, Telgu - FlexiPrep----Downloaded from flexiprep.com

    Visit examrace.com for free study material, doorsteptutor.com for questions with detailed explanations, and "Examrace" YouTube channel for free
    videos lectures

    Image of the Carbohydrate Digestion

    Q: 10. What would happen if were not secreted in the stomach?

    Answer:

    Hydrochloric acid is secreted by the glands present on the stomach walls. It dissolves bits of food
    and creates an acidic medium. The acidic medium allows pepsinogen to be converted into
    pepsin. Pepsin plays an important role in the digestion of proteins. Therefore, if were not
    secreted in the stomach, then pepsin would not be activated. This would affect protein digestion.
    A of about is necessary for proteins to be digested. This is achieved by .

    Q: 11. How does butter in your food gets digested and absorbed in the body?

    Answer

    Digestion of fats:

    Butter is a fat product and gets digested in the small intestine. The bile juice secreted by the liver
    contains bile salts that break down large fat globules into smaller globules, so as to increase their
    surface area for the action of lipase. This process is referred to as emulsification of fats.

    After this, the pancreatic lipase present in the pancreatic juice and the intestinal lipase present in
    the intestinal juice hydrolyse the fat molecules into triglycerides, diglycerides, monoglycerides,
    and ultimately into glycerol.

    2 of 3
    11/5/2019----Biology Class 11 NCERT Solutions: Chapter 16 Digestion and Absorption Part 3- Translation in Hindi, Kannada, Malayalam, Marathi,
    Punjabi, Sindhi, Sindhi, Tamil, Telgu - FlexiPrep----Downloaded from flexiprep.com

    Visit examrace.com for free study material, doorsteptutor.com for questions with detailed explanations, and "Examrace" YouTube channel for free
    videos lectures

    Image shows the fat digestion


    Image Shows the Fat Digestion

    Absorption of fats:

    Fat absorption is an active process. During fat digestion, fats are hydrolysed into fatty acids and
    glycerol. However, since these are water insoluble, they cannot be directly absorbed by the blood.
    Hence, they are first incorporated into small droplets called micelles and then transported into
    the villi of the intestinal mucosa.

    They are then reformed into small microscopic particles called chylomicrons, which are small,
    protein-coated fat globules. These chylomicrons are transported to the lymph vessels in the villi.
    From the lymph vessels, the absorbed food is finally released into the blood stream and from the
    blood stream, to each and every cell of the body.

    Developed by: Mindsprite Solutions

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