Tag: digestive system of human

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Questions Related to digestive system of human

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Choose the wrong statement among the following

  1. Trypsinogen is activated by enterokinase

  2. Optimum pH for salivary amylase is 8.9

  3. Rennin helps in digestion of milk proteins

  4. Goblet cells secrete mucus

  5. Submucosal glands of intestine are also known as Brunners glands
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Salivary amylase has an optimum pH of approximately 6.8. A pH of 8.9 is alkaline and would inhibit the activity of salivary amylase.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

A lubricant mucin, in saliva, is made up of

  1. Polyunsaturated fats

  2. Actin and myosin

  3. Glycoproteins

  4. Phospholipids
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A. Polyunsaturated fats are the fats in which hydrocarbon chain has two or more double bonds.
B. Actin and myosin are the protein filaments which help in muscle contraction.
C. Proteins associated with carbohydrates i.e. sugars attached to them, are called glycoproteins.
D. Lipids that contain a phosphate group, are called phospholipids.
The lubricant mucin in saliva is a glycoprotein. 
So, the correct answer is 'Glycoproteins'.
Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

About how much saliva does a person produce each day?

  1. 100 ml

  2. 250 ml

  3. 500 ml

  4. 1500 ml
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Humans produce between one-fifth and one-third of a gallon (0.75 to 1.5 liters) of saliva every day. However, saliva production mostly takes place while a person is awake. During sleep, saliva production drops to almost nothing. Most of the saliva comes from the glands at the bottom of the mouth, and the rest comes primarily from the parotid glands, near the top back of the mouth.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Numbers of pairs of salivary glands present in rabbit are

  1. One

  2. Three

  3. Four

  4. Five
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The rabbit has four major pairs of salivary glands: the parotid, mandibular, sublingual and zygomatic. Amylase and galactosidase are produced in the saliva, which is produced continuously by the mandibular glands and in response to food intake by the others.

Multiple choice bio-chemistry digestive system of human digestive system- glands mouth and buccal cavity digestive glands

Ptyalin enzyme is secreted by

  1. Salivary glands

  2. Mouth

  3. Oesophagus

  4. Stomach
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ptyalin is a form of amylase found in saliva of humans. Another name of ptyalin is salivary amylase. It is the most important amylolytic enzyme secreted in mouth (buccal cavity) by the salivary glands. The main function of ptyalin is to catalyze the hydrolysis of starch into maltose and dextrin. 

Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

Digestion of protein takes place in

  1. Duodenum and stomach

  2. Stomach and oesophagus

  3. Small and large intestine

  4. Intestine and rectum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Protein digestion begins in the stomach with pepsin and continues in the duodenum with pancreatic enzymes like trypsin and chymotrypsin.

Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

Which of the following is incorrect regarding the given digestion and absorption of protein?

  1. The breakdown of proteins to peptides is catalyzed by pepsin in the stomach and by the pancreatic enzymes trypsin and chymotrypsin in the small intestine.

  2. Peptides are broken down into amino acids by pancreatic carboxypeptidase and intestinal aminopeptidase.

  3. Small peptides consisting of two or three amino acids can diffuse through the epithelial cell and broken down into carbon dioxide and ammonia which are released into the blood.

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • Digestion of protein is initiated in the stomach by the enzyme pepsin.
  • In the small intestine, further digestion is done by trypsin, chymotrypsin, and carboxypeptidase into dipeptidase that releases from the pancreas.
  • Dipeptidase are broken into amino acids by intestinal dipeptidase.
  • These amino acids are absorbed actively by walls of intestine and release in the bloodstream.
  • These are utilized by tissues and broken down into carbon dioxide and ammonia.
  • Proteins require maximum energy to digest.

So the correct option is 'Peptides are broken down into amino acids by pancreatic carboxypeptidase and intestinal aminopeptidase.'

Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

How does pepsinogen change into its active form?

  1. In the presence of hydrochloric acid

  2. In the presence of trypsin

  3. In the presence of bile

  4. In the presence of carboxypeptidae
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Parietal cells of stomach secrets hydrochloric acid which convert inactive pepsinogen to partially active pepsinogen, partially activates pepsinogen then cleaves the peptide from other pepsinogen molecules to form active pepsin which converts protein into proteases and peptides.

So, the correct answer is 'In the presence of hydrochloric acid'.