Biology · Science General

Human Digestive System

1,953 Questions

The human digestive system explores the breakdown of biomacromolecules, covering organs from the stomach to the small intestine. It involves physiological processes like chyme movement, pH levels, and nutrient absorption in the gut. These fundamental biology concepts are regularly featured in medical and general science competitive exams.

Small intestine functionsBiomacromolecule breakdownStomach and digestionIntestinal bacteria

Human Digestive System Questions

Multiple choice

Which of the following functions does not happen in the stomach?

  1. Enzyme amylase acts on starch, and breaking it into maltose.

  2. Helps in breakdown of fibrous tissue.

  3. Kills bacteria.

  4. Enzyme pepsin breaks down protein.

  5. Churning the food.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This happens in the mouth where salivary glands produce saliva that contains the enzyme amylase.

Multiple choice

Trypsinogen is converted into active trypsin by the action of

  1. CCK

  2. PKZ

  3. Enterokinase

  4. Secretin

  5. Duocrinin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This enzyme, present in Succus entericus, activates inactive trypsinogen ( zymogen or inactive enzyme) secreted from exocrinal part of pancreas to form active proteolytic enzyme trypsin.

Multiple choice

The gastrointestinal hormone which is responsible for the secretion of mucus and HCO3 from Brunner’s glands of small intestine is

The endocrine cells present in different parts of Gastrointestinal tract secrete some local hormones which are proteinaceous in nature.

 

 

 

  1. secretin

  2. kallikreine

  3. duocrine

  4. gastrin

  5. cholecystokinin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is an intestinal hormone. It stimulates secretion of mucus and HCO3 from Brunner’s glands that produces succus entericus.

Multiple choice

Which of the following matches of enzyme and its use is not correct?

  1. Streptokinase: Lysis of blood clots

  2. Rennin: Cheese production

  3. Cellulase: Fruit and vegetable processing

  4. Lipase: Fat and oil processing

  5. Acidic protease: Detergent making
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Alkali proteases find extensive application in detergent and leather industries. Acidic proteases are used in cheese production.

Multiple choice

Which of the following sets represents enzymes present in pancreatic juice?

  1. Ptyalin, Rennin, Lactase, Pepsin, Sucrase

  2. Trypsin, Chymotrypsin, Carboxypeptidase, Amylase, lipase

  3. Ptyalin, Trypsin, Chymotrypsin, Lactase, Lipase

  4. Carboxypeptidase, Amylase, Lipase, Lactase, Sucrase

  5. Rennin, Pepsin, Trypsin, Chymotrypsin, Carboxypeptidase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Trypsin, Chymotrypsin, Carboxypeptidase, Amylase, lipase: All are present in pancreatic juice.

Multiple choice

Which of the following pairs is matched correctly?

  1. Pepsin - digests starch

  2. Amylase - breaks down proteins

  3. Bile - breaks fats present in food

  4. Trypsin - breaks starch

  5. Lipase - protects inner lining of stomach
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct answer as bile salts are made in liver and they help emulsify or break down the fats or lipids present in the food so that it makes it easy for the enzymes to act and digest them.

Multiple choice

Food is churned in the stomach for about three hours and broken into a semi-solid paste. The tubular glands present in the stomach secrete gastric juice. Which of the following substances are contained in this gastric juice?

  1. Amylase, pepsin and mucus

  2. Amylase, hydrochloric acid and mucus

  3. Hydrochloric acid, pepsin and amylase

  4. Mucus, hydrochloric acid and pepsin

  5. Pepsin and hydrochloric acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer. Gastric juices contain hydrochloric acid, pepsin and mucus.

Multiple choice

Which of the following sets of hormones is secreted by Islets of Langerhans?

  1. Epinephrine, Cortisone and Insulin

  2. Insulin, Somatostatin and Glucagon

  3. Mineralocorticoids, Glucocorticoids and Adrenal

  4. Glucagen, Glycogen and Insulin

  5. Adrenal, Insulin and Thyroxin

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Islets of Langerhans are groups of hormone secreting cells scattered in the entire pancreas. It possesses three hormones; insulin, glucagon and somatostatin from three different kinds of cells called beta, alpha and delta cells, respectively.