Biology · Science General

Human Digestive System

2,002 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 bio-chemistry digestion digestive glands liver pancreas

Succus entericus is secreted by

  1. Crypts of Lieberkuhn

  2. Brunners glands

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Succus entericus, or intestinal juice, is primarily secreted by the Crypts of Lieberkuhn. Brunner's glands are located in the duodenum and secrete alkaline mucus, not the full composition of succus entericus.

Multiple choice bio-chemistry digestion digestive glands liver pancreas

In the absence of enterokinase, digestion would be affected in intestine of

  1. Maltose

  2. Starch

  3. Albumin

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

Enterokinase is an enzyme that activates trypsinogen into trypsin. Trypsin is essential for activating other pancreatic proteases, which are required for the digestion of proteins like albumin.

Multiple choice bio-chemistry digestion digestive glands liver pancreas

The cells lining the base of intestinal glands that secrete lysozyme are

  1. Brunners gland

  2. Parietal cells

  3. Neck cells

  4. Paneth cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Paneth cells are located at the base of the Crypts of Lieberkuhn and are known to secrete antimicrobial substances, including lysozyme, to protect the intestinal lining.

Multiple choice bio-chemistry digestion digestive glands liver pancreas
Lining of intestine of man is ________________.

  1. Brush bordered

  2. Ciliated

  3. Non-keratinised

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

The outer surface of columnar epithelial cells lining the intestine of man is brush-bordered. It is made up of microvilli that greatly increase the surface area for absorption.

Multiple choice bio-chemistry digestion digestive glands liver pancreas

Which of the following statement is not correct?

  1. Burner's glands are present in the submucosa of stomach and secrete pepsinogen

  2. Goblet cells are present in the mucosa of intestine and secrete mucus

  3. Oxyntic cells are present in the mucosa of stomach and secrete HCl

  4. Acini are present in the pancreas and secrete carboxypeptidase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The Burner's glands are present in the submucosa of the small intestine and secrete an alkaline fluid rich in mucin that protects the duodenal surface of the small intestine from the action of the acidic chyme.
So, the correct answer is 'Burner's glands are present in the submucosa of the stomach and secrete pepsinogen'.
Multiple choice bio-chemistry digestion digestive glands liver pancreas

Which of the following statements regarding small intestine are incorrect?
(i) Throughout the small intestine, there are crypts of Lieberkuhn at the base of the villi.
(ii) In duodenum, there are, in addition, small rounds peptic glands.
(iii) The small intestine is strongly -self-protective; by means of a copious production of mucus and a mechanism for the rapid replacement of cells I damaged by contact with fooiLapd. digestive juices.
(iv) Each villus is richly supplied with blood capillaries only.

  1. (i) and (iv)

  2. (ii) and (iv)

  3. (iii) and (iv)

  4. (i) and (ii)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct answer is (b). 

Multiple choice bio-chemistry digestion digestive glands liver pancreas

Sacculus rotundus is a dilated part as posterior end of

  1. Ileum

  2. Oesophagus

  3. Ilium

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

  • An anatomic structure exclusive to rabbits that are located at the terminal part of the ileum is sacculus rotundus. 
  • It is formed at the distal end of ileum and is expanded to form a small dilated spherical sac in a rabbit.
  •  It is rich in lymphoid tissue. Hence, Sacculus rotundus is a dilated part as posterior end of the ileum.
So, the correct answer is 'ileum'.

Multiple choice bio-chemistry digestion digestive glands liver pancreas

Crypts in between the bases of villi in the intestine are crypts of Lieberkuhn. Which of the following cells in these crypts secrete digestive enzymes?

  1. Pariental cells

  2. Paneth cells

  3. Zymogen cells

  4. Argentaffin cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation


Crypts are anatomical structures that are narrow but deep invaginations into a larger structure. One common type of anatomical crypt is the Crypts of Lieberkühn. Crypts of Lieberkuhn between the bases of villi in the intestine have the Paneth cells which secrete digestive enzymes.

So, the correct option is 'paneth cells'.

Multiple choice bio-chemistry digestion digestive glands liver pancreas

A carbohydrate splitting enzyme is secreted by 

  1. Liver

  2. Zymogen cells of gastric glands

  3. Spleen

  4. Crypts of Lieberkuhn
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

While the chyme is present within the small intestine, glands within this structure begin to secrete different types of digestive enzymes, called carbohydrases (amylase, proteases, and lipases or fat splitting enzymes). The glands responsible for these enzymatic secretions are found in the mucosal layer of the small intestine, called the crypts of Lieberkuhn.

Multiple choice bio-chemistry digestion digestive glands liver pancreas

Crypts of lieberkuhn are present in

  1. Intestine

  2. Stomach

  3. Oesophagus

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An intestinal gland (crypts of Lieberkuhn) is a gland found in the epithelial lining of the small intestine and colon. The glands are named after German anatomist J. N. Lieberkuhn.

Multiple choice bio-chemistry digestion digestive glands liver pancreas

Crypts of Lieber kuhn are present in ___________.

  1. Intestine

  2. Stomach

  3. Oesophagus

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Crypts of Lieberkuhn are tubular glands found in the intestinal mucosa, specifically between the villi in the small intestine.

Multiple choice biology digestive system of human digestive glands liver pancreas

Stool of a person contain whitish grey colour due to malfunction of which type of organ : -

  1. Pancrease

  2. Spleen

  3. Kidney

  4. Liver
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Bilirubin is broken down to urobilinogen and stereobilinogen. The yellowish-brown colour of stool is due to the stereobilinogen. Due to the malfunctioning of the liver, insufficient production of stereobilinogen leads to white stool.

So, the correct answer is 'Liver'.
Multiple choice biology digestive system of human digestive glands liver pancreas

The pancreas produces?

  1. Three digestive enzymes and one hormone

  2. Three types of digestive enzymes and two hormones

  3. Two digestive enzymes and one hormone

  4. Only digestive enzyme and no hormone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The pancreas produces majorly three types of digestive enzymes:
  • Proteases: to digest proteins.
  • Lipase: to break down fats.
  • Amylase: for the digestion of carbohydrates.

 The pancreas maintains the body’s blood glucose (sugar) balance. Primary hormones of the pancreas include insulin and glucagon, and both regulate blood glucose.
  • Insulin: This hormone regulates blood glucose by allowing many of your body’s cells to absorb and use glucose. In turn, this drops blood glucose levels.
  • Glucagon: Glucagon helps insulin maintain normal blood glucose by working in the opposite way of insulin. It stimulates your cells to release glucose, and this raises your blood glucose levels.

So, the correct answer is 'Three types of digestive enzymes and two hormones'.

Multiple choice biology digestive system of human digestive glands liver pancreas

Simple absorbable forms are produced by secretions of all except

  1. Hepatocytes

  2. Enterocytes

  3. Parietal cells

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

Hepatocytes produce bile, which emulsifies fats but does not contain digestive enzymes that break down macromolecules into absorbable forms. Enterocytes, parietal cells, and oxyntic cells all contribute to the production of enzymes or acid that facilitate digestion.

Multiple choice biology digestive system of human digestive glands liver pancreas

Removal of the pancreas impairs the breakdown of 

  1. lipids and carbohydrates only

  2. lipids and proteins only

  3. lipids, proteins and carbohydrates

  4. proteins and carbohydrates only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pancreas secretes pancreatic juice containing enzymes for all three major classes of nutrients: amylase for carbohydrates, lipases for lipids, and proteases (like trypsin) for proteins.