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

The pancreas secretes

  1. Bile juice

  2. Insulin

  3. Vitamin A

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

Pancreas secretes two hormones called insulin and glucagon, which convert excessive glucose into glycogen and glycogen into glucose.

Multiple choice

Enzymes help in

  1. Immune system

  2. Respiration

  3. Reproduction

  4. Digestion of food
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Enzymes are protein molecules that are made by all plant and animal cells. Enzymes are catalysts. A catalyst makes chemical reactions occur in a more optimum manner. Digestive enzymes cause food that we eat to be broken down much faster, and much more effectively, than would occur without them. Enzymes help in Digestion of food.

Multiple choice

Food is normally digested in the

  1. Small intestines

  2. Liver

  3. Stomach

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

Digestion involves mixing food with digestive juices, moving it through the digestive tract, and breaking down large molecules of food into smaller molecules. Digestion begins in the mouth, when you chew and swallow, and is completed in the small intestine.

Multiple choice

The large intestine of mammals is further divided into

  1. colon and rectum

  2. colon and atria

  3. atria and haustra

  4. jejunum and colon

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Large intestine is divided into rectum and colon which are long, hollow tubes that run from the stomach to the anal opening.

Multiple choice

Loss of appetite is called ____.

  1. marasmus

  2. anorexia

  3. filaria

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

Anorexia is a medical term referring to a loss of appetite or a refusal to eat. It can be a symptom of various underlying physical or psychological conditions.

Multiple choice

Which of the following enzymes act efficiently at pH two?

  1. trypsin

  2. pepsin

  3. ptyalin

  4. all of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pepsin acts within the stomach so its optimum pH is around 2, an acidic pH. When the enzyme enters the duodenum, it comes in contact with a higher pH and its enzyme activity comes to and end. 

Multiple choice

Pepsin digests the

  1. proteins in stomach

  2. carbohydrates in duodenum

  3. proteins in duodenum

  4. fats in ileum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pepsin digests the proteins in stomach. 

Multiple choice

Saliva has the enzyme

  1. pepsin

  2. ptyalin

  3. trypsin

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

Ptyalin (Salivary amylase).It is found in saliva and breaks starch into maltose and dextrin. 

Multiple choice

Trypsin enzyme in mammals is formed from the

  1. trypsinogen by the action of enterokinase

  2. trypsinogen by the action of protein

  3. trypsinogen by the action of fat

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Trypsin enzyme in mammals is formed from the trypsinogen by the action of enterokinase. 

Multiple choice

Pepsinogen is secreted by

  1. gastric glands

  2. intestinal glands

  3. chief cells

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

Pepsinogen is secreted by chief cells. The chief cells have an extensive network of landler rough endoplasmic reticulum organised around the nucleus. They also contain many large secretory vesicles filled with digestive enzymes in the pilar cytoplasm.

Multiple choice

Curdling of milk in the stomach is due to the action of

  1. pepsin

  2. rennin

  3. HCl

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

Rennin, protease found in rennet. It is produced by newborn ruminant animals in the lining of the fourth stomach to curdle the milk they ingest, allowing a longer residence in the bowels and better absorption. It is widely used in the production of cheese. 

Multiple choice

A bolus is

  1. a mass of crushed food moistened with saliva

  2. the semisolid material resulting from partial digestion in the stomach

  3. the milky emulsified fat absorbed from small intestine

  4. an indigestible material that helps in movement and absorption
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A bolus is a mass of food that (with animals that can chew) has been chewed at the point of swallowing. Under normal circumstances, the bolus then travels down the oesophagus to the stomach for digestion.