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 statements is/are false?

a. Cardiac portion, fundic portion and pyloric portion are the three major parts of a human stomach. b. Oesophagus is a tube that extends posteriorly, passing through the neck, thorax and diaphragm. c. Vermiform appendix is a narrow, finger-like tubular projection that arises from the colon.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only c

  5. Only b and c
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option as this statement is false. Vermiform appendix is a narrow, finger-like tubular projection that arises from the caecum.

Multiple choice

The innermost layer lining the lumen is the mucosa. Which of the following statements regarding mucosa is/are false?

a. Mucosa layer forms irregular folds in the stomach. b. Mucosa layer forms finger-like foldings in the large intestine. c. Mucosa layer forms gastric glands in the stomach.

  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
C Correct answer
Explanation

This is the correct option as this statement regarding mucosa layer is false. Mucosa layer forms finger-like foldings called villi in the small intestine.

Multiple choice

Which of the following statements is/are false?

a. The ileo-caecal valve prevents the back flow of the faecal matter. b. Fructose, fatty acids, glycerol and amino acids are absorbed through the mucosa into the blood stream. c. The digestive enzyme lysozyme digests the starch and converts it into maltose.

  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 digestive enzyme salivary amylase digests the starch and converts it into maltose.

Multiple choice

Match the following:

 
a. Serosa layer 1. It is made of loose connective tissues containing nerves, blood and lymph vessels.
b. Muscularis layer 2. It is made up of a thin mesothelium with some connective tissues.
c. Sub-mucosal layer 3. It is made by smooth muscles usually arranged into an inner circular and an outer longitudinal layer.

  1. a - 2, b - 3, c - 1

  2. a - 2, b - 1, c - 3

  3. a - 3, b - 2, c - 1

  4. a - 1, b - 2, c - 3

  5. a - 1, b - 3, c - 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. Serosa layer is made up of a thin mesothelium with some connective tissues. Muscularis layer is made by smooth muscles usually arranged into an inner circular and an outer longitudinal layer. Sub-mucosal layer is made of loose connective tissues containing nerves, blood and lymph vessels.

Multiple choice

Which of the following is the function of intestinal 'Brush border'?

  1. Secretion

  2. Absorption

  3. Receptive/ sensory

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

A brush border (striated border or brush border membrane) is the microvilli-covered surface of simple cuboidal epithelium and simple columnar epithelium cells found in certain locations of the body. It increases absorption.

Multiple choice

A starving person digests the stored food in the order

  1. proteins - fats - glycogen

  2. glycogen - fats - proteins

  3. glycogen - proteins - fats

  4. fats - glycogen - protein
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct order as first, the stored glycogen is used, then fats and lastly protein stores are digested by the starving person.