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 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.

Multiple choice biology digestive system of human digestive glands liver pancreas

Pancreas has double role of

  1. Storage and digestion

  2. Digestion and absorption

  3. Digestion and endocrine activity

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

The pancreas is a heterocrine gland; it functions as an exocrine gland by secreting digestive enzymes into the duodenum and as an endocrine gland by secreting hormones like insulin and glucagon into the blood.

Multiple choice biology digestive system of human digestive glands liver pancreas

Exocrine part of pancreas for release of pancreatic salt is stimulated by _____________.

  1. Secretin

  2. Gastrin

  3. OCK

  4. Gastric inhibitory peptide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Secretin is a hormone released by the S cells of the duodenum in response to acidic chyme entering the small intestine. It stimulates the exocrine pancreas to release bicarbonate-rich pancreatic juice (which contains salts) to neutralize the acid. Gastrin stimulates gastric acid secretion, CCK stimulates pancreatic enzyme secretion, and GIP inhibits gastric motility.

Multiple choice biology digestive system of human digestive glands liver pancreas

Which of the following organs is responsible for storing excess bile produced by the liver?

  1. Gall bladder

  2. Pancreas

  3. Duodenum

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

The liver produces bile, which is stored in the gall bladder before entering the bile duct into the duodenum

So, the correct answer is 'Gall bladder'

Multiple choice biology digestive system of human digestive glands liver pancreas

Which of the following digestive glands secretes a digestive juice which does not contain enzymes?

  1. Salivary

  2. Liver

  3. Pancreas

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

  • The liver performs a variety of functions such as synthesis, storage and secretion of various substances. The liver secretes bile juice.
  • The bile secreted by the hepatic cells is released into the duodenum contains bile pigments, bilirubin and biliverdin formed by the breakdown of haemoglobin of the old RBC destroyed in the body., bile salts such as glycocholates and taurocholate of sodium and potassium, cholesterol and phospholipids but no enzymes. 
  • The bile secreted is a yellowish-green fluid that helps in the emulsification of fats. Bile is not an enzyme, but it does contain bile salts that emulsify large fat droplets. Hence, the liver is the digestive glands secretes a digestive juice which does not contain enzymes.
So, the correct answer is 'liver'.

Multiple choice biology digestive system of human digestive glands liver pancreas

Which of the following is not a function of bile?

  1. Bile neutralises the acidic traces of food

  2. It provides an alkaline medium for the intestinal proteases

  3. It contains a lipase

  4. Its salts emulsify fats
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  1. Bile is a dark green to yellowish brown fluid, produced by the liver of most vertebrates, bile helps in the digestion of lipids in the small intestine. In humans, bile is produced continuously by the liver and stored and concentrated in the gallbladder.
  2. The composition of hepatic bile is water, bile salts, bilirubin, fats (cholesterol, fatty acids, and lecithin), and inorganic salts.
  3.  Lipase is an enzyme secreted by pancreas and lipase is present in pancreatic juice. Lipase helps your body digest fats. Hence, the bile does not contain lipase.
So, the correct answer is 'it contains a lipase'.

Multiple choice biology digestive system of human digestive glands liver pancreas

Digestive System
Which of the following statement is incorrect about pancreas? 

  1. It is a compound gland as it has both exocrine and endocrine part.

  2. Exocrine part secretes alkaline pancreatic juice having enzymes.

  3. Endocrine part secretes hormones like insulin and glucagon.

  4. It is surrounded by Glisson's capsule.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Each hepatic lobule of the liver is covered by a thin connective tissue sheath called the Glisson's capsule. So, the correct answer is (d).