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 general knowledge science & technology

Enzymes help in...

  1. Respiration

  2. Digestion of food

  3. Immune system

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

Enzymes are biological catalysts that speed up chemical reactions. While enzymes ARE involved in all processes listed (respiration, digestion, immune system, and reproduction), digestion is the most direct and commonly tested association - enzymes like amylase, protease, lipase break down food molecules.

Multiple choice

Which of the following statements is/are false?

a. Energy is needed by living as well as non-living things to work. b. The digested food is absorbed by the walls of intestine and carried by blood to different parts of the body. c. The lungs get rid of the nitrogen gas as one breathes out.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this statement is false. The lungs get rid of the carbon dioxide gas as one breathes out.

Multiple choice

What does the term 'egestion' mean?

  1. Eating food

  2. Swallowing food

  3. Digesting food

  4. Faeces being removed through anus

  5. Nutrients being absorbed through villi
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Faeces being removed through anus is egestion.

Multiple choice

Pepsin is a protein-digesting enzyme in our stomach. But this enzyme is mostly secreted as a pro-enzyme called pepsinogen. Why is it secreted in this inactive form?

  1. Active pepsin will digest the wall of stomach in the absence of food.

  2. Active pepsin gets inactivated fast.

  3. Hydrochloric acid in stomach will destroy pepsin.

  4. Active pepsin will break down fats in food.

  5. Inactive pepsinogen gives time for food to reach the stomach by peristalsis.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Active pepsin will digest the wall of the stomach in the absence of food as pepsin is a protein digesting enzyme.

Multiple choice

What is peristalsis?

  1. Rhythmic wave-like movements of the food through the alimentary tract

  2. The act of swallowing food

  3. Grinding of food by teeth

  4. Mixing of chewed food with enzymes

  5. Churning of food by stomach
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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