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

Which of the following statements regarding the functions of bile is/are false?

a. It makes the acidic food coming from the stomach alkaline, so that pancreatic enzymes can act on it. b. Bile salts break the fats present in the food into small globules making it easy for the enzymes to act and digest them. c. It makes the medium of gastric juices acidic, so that the enzyme pepsin can digest the proteins properly.

  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 regarding the functions of bile is false. It is the hydrochloric acid in the stomach that makes the medium of gastric juices acidic, so that the enzyme pepsin can digest the proteins properly.

Multiple choice

Match the following:

 
a. Assimilation 1. It is the process in which the food is taken into the body.
b. Ingestion 2. It is the process in which the absorbed food is taken in by the body cells and used for energy, growth and repair.
c. Digestion 3. It is the process in which the food containing large, insoluble molecules is broken down into small water soluble molecules.

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

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

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

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

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

This is the correct option. Assimilation is the process in which the absorbed food is taken in by the body cells and used for energy, growth and repair. Ingestion is the process in which the food is taken into the body. Digestion is the process in which the food containing large, insoluble molecules is broken down into small water soluble molecules.

Multiple choice

Which of the following functions does not happen in the stomach?

  1. Enzyme amylase acts on starch, and breaking it into maltose.

  2. Helps in breakdown of fibrous tissue.

  3. Kills bacteria.

  4. Enzyme pepsin breaks down protein.

  5. Churning the food.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This happens in the mouth where salivary glands produce saliva that contains the enzyme amylase.

Multiple choice

Trypsinogen is converted into active trypsin by the action of

  1. CCK

  2. PKZ

  3. Enterokinase

  4. Secretin

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

This enzyme, present in Succus entericus, activates inactive trypsinogen ( zymogen or inactive enzyme) secreted from exocrinal part of pancreas to form active proteolytic enzyme trypsin.

Multiple choice

The gastrointestinal hormone which is responsible for the secretion of mucus and HCO3 from Brunner’s glands of small intestine is

The endocrine cells present in different parts of Gastrointestinal tract secrete some local hormones which are proteinaceous in nature.

 

 

 

  1. secretin

  2. kallikreine

  3. duocrine

  4. gastrin

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

It is an intestinal hormone. It stimulates secretion of mucus and HCO3 from Brunner’s glands that produces succus entericus.

Multiple choice

Which of the following matches of enzyme and its use is not correct?

  1. Streptokinase: Lysis of blood clots

  2. Rennin: Cheese production

  3. Cellulase: Fruit and vegetable processing

  4. Lipase: Fat and oil processing

  5. Acidic protease: Detergent making
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Alkali proteases find extensive application in detergent and leather industries. Acidic proteases are used in cheese production.

Multiple choice

Which is the future alimentary canal?

  1. Blastopore

  2. Archenteron

  3. Delamination

  4. Epiboly

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

Archenteron is the cavity, which occurs inside gastrula and is the future alimentary canal. It opens to the outside through blastopore, which later on closes.