Tag: mechanism of digestion

Questions Related to mechanism of digestion

Lipase acts on ________________.

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

  1. Proteins

  2. Fats

  3. Carbohydrates

  4. Aminoacids

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Correct Option: A

The major site of protein breakdown to form free amino acids, is in the

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

  1. Kidney

  2. Spleen

  3. Intestine

  4. Bone-marrow

Show answer
Correct Option: C
Explanation:

Pancreatic juice contains pancreatic amylase, lipase and trypsin, trypsin converts polypeptides into the dipeptides in the first part of small intestine i.e., duodenum. The succus entricus in the third part of small intestine i.e., ileum converts dipeptides into the amino acids which are absorbed by the wall of the intestine. Thus, the correct answer is option C.

Proteins are broken down into amino acids completely in

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

  1. Buccal cavity

  2. Stomach

  3. Intestine

  4. Rectum

Show answer
Correct Option: C
Explanation:
  • Once a protein source reaches your stomach, hydrochloric acid, and enzymes called proteases to break it down into smaller chains of amino acids. 
  • Amino acids are joined together by peptides, which are broken by proteases.
  • Digestion of protein is completed in the small intestine by the pancreatic enzymes trypsin, chymotrypsin, and carboxypeptidase. Hence, Proteins are broken down into amino acids completely in Intestine. 
So, the correct answer is 'Intestine'.

The three secretions meeting the food in small intestine are

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

  1. Bile juice, pancreatic juice and intestinal juice

  2. Pancreatic, intestinal and gastric juice

  3. Bile, pancreatic and gastric juice

  4. Bile, gastric juice and saliva

Show answer
Correct Option: A
Explanation:

Various types of movements are generated by the muscularis layer of the small intestine. These movements help in a thorough mixing up of the food with various secretions in the intestine and thereby facilitate digestion. The bile, pancreatic juice and the intestinal juice are the secretions released into the small intestine. Pancreatic juice and bile are released through the hepato-pancreatic duct. The intestinal mucosal epithelium has goblet cells, which secrete mucus. The secretions of the brush border cells of the mucosa along with the secretions of the goblet cells constitute the intestinal juice or succus entericus.

Digestion of carbohydrates, proteins and fats completes in

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

  1. Stomach

  2. Liver

  3. Small intestine

  4. Large intestine

Show answer
Correct Option: C
Explanation:

Small intestine has three parts - duodenum, jejunum and ileum. When food leaves the stomach through its pyloric end and enters the duodenum it is called chyme (acidic). The digestion of macro molecules ingested is completed in small intestine. The digested products are absorbed in the small intestine and comes to the blood.

Maximum digestion of food takes place in

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

  1. Stomach

  2. Jejunum

  3. Colon

  4. Duodenum

Show answer
Correct Option: D
Explanation:
  • Small intestine has three parts - duodenum, jejunum, and ileum. 
  • The maximum digestion of food takes place in the duodenum. While the digestion of food is completed in jejunum.
  •  The maximum absorption of food takes place in ileum.

End products of protein hydrolysis are

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

  1. Mixture of amino acids

  2. Sugars

  3. Peptides

  4. 25 amino acids

Show answer
Correct Option: A
Explanation:

Proteins are biopolymers made up of  by joining together of amino acids with the help of peptide bonds. When proteins are acted upon by digestive proteolytic enzymes in the gut the peptide bonds are hydrolyzed and a mixture of amino acids is obtained.

Which one of the following pairs of the cells with their secretion is correctly matched?

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

  1. Oxyntic cells- A secretion with pH between 2.0 and 3.0

  2. Alpha cells of Islets of Langerhans- Secretion that decreases blood sugar level

  3. Kupffer cells- A digestive enzyme that hydrolysis nucleic acids

  4. Sebaceous glands- A digestive enzyme that hydrolysis nucleic acids

Show answer
Correct Option: A
Explanation:

Oxyntic cells or parietal cells, are the stomach epithelium cells that secrete gastric acid intrinsic factor. These cells secrete hydrochloric acid (HCl), which makes the gastric juice acidic (pH =2 -3). 

Oxyntic cells  are the epithelial cells that secrete hydrochloric acid (HCl) and intrinsic factor. These cells are located in the gastric glands found in the lining of the fundus and in the body of the stomach.
Alpha cells of islets of Langerhans secretes glucagon hormone, which increase the glucose level in the blood by converting glycogen to glucose in liver cells. 

Kupffer cells are specialized cells in the liver that destroy bacteria, foreign proteins and worn-out blood cells. 
Sebaceous glands and microscopic glands in the skin that secrete an oily/waxy matter (called as sebum) to lubricate the skin and hair of mammals.

Therefore, the correct answer is option A.

Where is protein digestion accomplished?

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

  1. Stomach

  2. Ileum

  3. Rectum

  4. Duodenum

Show answer
Correct Option: B
Explanation:

Protein digestion occurs in stomach, duodenum, jejunum and ileum. It is completed in ileum.

The organ that stores bile is

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

  1. Pancreas

  2. Liver

  3. Gall bladder

  4. Spleen

Show answer
Correct Option: C
Explanation:

The digestive role of the liver is to produce bile and export it to the duodenum. The gall bladder primarily stores, concentrates and releases bile. 

So, the correct answer is 'Gall bladder'.