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

A man cannot digest cellulose whereas cows can do so because

  1. their gut contains certain bacteria capable of digesting cellulose

  2. they have a many-chambered stomach

  3. they have efficient molars for grinding

  4. they produce an enzyme that can digest cellulose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A man cannot digest cellulose whereas cows can do so because their gut contains certain bacteria capable of digesting cellulose.

Multiple choice

Trypsinogen (inactive trypsin) is secreted by

  1. duodenum

  2. liver

  3. pancreas

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

Trypsinogen (inactive trypsin) is secreted by pancreas. It is found in pancreatic juice, along with amylase, lipase and chymotrypsinogen. It is activated by enteropeptidase, which is found in the intestinal mucosa, to form trypsin. Once activated, the trypsin can activate more trypsinogen into trypsin. Trypsin cleaves the peptide bond on the carboxyl side of basic amino acids such as arginine and lysine. 

Multiple choice

What is peristalsis?

  1. Grinding of food by teeth

  2. Rhythmic wave-like movements of alimentary tract.

  3. The act of swallowing food.

  4. Churning of food by stomach

  5. Mixing of chewed food with enzymes.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rhythmic wave-like movements of the food through the alimentary tract is called peristalsis.

Multiple choice

Which is not a function of hydrochloric acid in stomach?

  1. Kills pathogens that enter along with food.

  2. Gives an acidic medium for enzymes to act.

  3. Activates trypsinogen.

  4. Helps in easy breakdown of food.

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

Trypsinogen is found in the small intestine. Hydrochloric acid becomes de-activated and the medium becomes alkaline, when food enters the small intestine.

Multiple choice

What does the term 'egestion' mean?

  1. Nutrients being absorbed through villi

  2. Faeces being removed through anus

  3. Food being broken down into simpler form

  4. Swallowing food

  5. Eating food
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Faeces being removed through anus is egestion..