Tag: digestion in intestine

Questions Related to digestion in intestine

If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen? 

bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

  1. The pancreatic enzymes and specially the trypsin and lipase will not work efficiently.

  2. The pH of stomach will fall abruptly.

  3. Steapsin will be more effective.

  4. Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones.

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Correct Option: D
Explanation:

Parietal cells secrete HCl and intrinsic factor. Parietal glands also secrete pepsinogen to which hydrochloric acid acts to convert it into pepsin. Pepsin in return causes digestion of protein. If parietal cells become non-functional, it will directly affect protein digestion. So, the correct answer is (d).

When the acidic food from stomach comes to small intestine which of the following acts on it to make it alkaline?

bio-chemistry coordination in life processes role of intestine digestion in intestine mechanism of digestion digestive system - organs

  1. Bile

  2. Trypsin

  3. Pepsin

  4. None of the above

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Correct Option: A
Explanation:
  • The pancreatic enzymes and intestinal enzymes are optimally active in alkaline pH (8.0-8.4) in the small intestine.
  • Thus, the acidic food from stomach is made alkaline by the action of bile.
  • Bile is alkaline in nature as it contains organic salt known as bile salt.

Protein digesting enzyme is

bio-chemistry digestive system of human role of intestine digestion in intestine mechanism of digestion

  1. Pepsin

  2. Ptyalin

  3. Amylase

  4. Maltase

  5. Sucrase

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Correct Option: A
Explanation:
  1. Pepsin is produced in the stomach and is one of the main digestive enzymes, which helps in digestion of the proteins in food. Zymogenic cell or peptic cell is a cell in the stomach that releases pepsinogen and chymosin.
  2.  The inactive pepsinogen, on exposure to hydrochloric acid, gets converted to the active enzyme pepsin, the proteolytic enzyme of the stomach. Pepsin converts proteins into proteoses and peptones (peptides). 
  3. Pepsin hydrolyses proteins to polypeptide chains and initiates protein digestion  Hence, the protein-digesting enzyme is pepsin.
So, the correct answer is 'pepsin'.

I. Amylase
II. Lipase
III. Pepsin
IV. Trypsin

Out of the aforementioned enzymes, the protein-digesting enzymes are

bio-chemistry digestive system of human role of intestine digestion in intestine mechanism of digestion

  1. I and II.

  2. I and III.

  3. II and III.

  4. II and IV.

  5. III and IV.

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Correct Option: E
Explanation:

Protein digestive enzymes are pepsin and trypsin. They break down proteins into smaller peptides and amino acids. Pepsin is secreted by the gastric gland in the stomach where as trypsin is secreted by Pancreas.

Amylase and Lipase are other important digestive enzymes as well and they help in digestion of starch and fats respectively. Hence option E is correct.

Which is not a parasite of the human intestine ?

bio-chemistry digestive system of human role of intestine digestion in intestine digestive system - organs

  1. ringworm

  2. pinworm

  3. threadworm

  4. tapeworm

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Correct Option: A
Explanation:
They have long round bodies and range in size. Roundworms can live in or on humans and can cause many problems. They are usually found in soil and stool and can enter the body through the mouth or direct contact with the skin. They can live in the human intestine for a very long time. They are called normal Flora.
So the correct option is 'Ringworm'.

If the chyme is pushed backwards in small quantity, then it reaches to

bio-chemistry digestive system of human role of intestine digestion in intestine digestive system - organs

  1. Large intestine

  2. Duodenum

  3. Oesophagus

  4. Small intestine

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Correct Option: A

The term "Faeces" used for the undigested substances present in ___

bio-chemistry digestive system of human role of intestine digestion in intestine digestive system - organs

  1. $Caecum$

  2. $Colon$

  3. $Rectum$

  4. $Anus$

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Correct Option: A

Escherichia coil lives in human and animal intestine. It is

bio-chemistry digestive system of human role of intestine digestion in intestine digestive system - organs

  1. Gram-positive and rod-shaped

  2. Gram-positive and spiral-shaped

  3. Gram-negative and rod-shaped

  4. Gram-negative and spherical

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Correct Option: A

Finger like projections present in large intestine are called _____

bio-chemistry digestive system of human role of intestine digestion in intestine digestive system - organs

  1. Jejunum

  2. Colon

  3. Villi

  4. Rectum

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Correct Option: C
Explanation:

Digestion ends in small intestine. Waste products are excreted from our body through large intestine. Excess water and salts are absorbed from intestine through muscular finger like projections called Villi.

Microbes present in one large intenstine

bio-chemistry digestive system of human role of intestine digestion in intestine digestive system - organs

  1. Fungi

  2. Bacteria

  3. Virus

  4. All

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Correct Option: B
Explanation:

Many microbes present in alimentary canal of some animals like cones help in digestion and absorption of food. Bacteria in our large intestine helps in bowel movement.