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 sets represents enzymes present in pancreatic juice?

  1. Ptyalin, Rennin, Lactase, Pepsin, Sucrase

  2. Trypsin, Chymotrypsin, Carboxypeptidase, Amylase, lipase

  3. Ptyalin, Trypsin, Chymotrypsin, Lactase, Lipase

  4. Carboxypeptidase, Amylase, Lipase, Lactase, Sucrase

  5. Rennin, Pepsin, Trypsin, Chymotrypsin, Carboxypeptidase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Trypsin, Chymotrypsin, Carboxypeptidase, Amylase, lipase: All are present in pancreatic juice.

Multiple choice

Which of the following pairs is matched correctly?

  1. Pepsin - digests starch

  2. Amylase - breaks down proteins

  3. Bile - breaks fats present in food

  4. Trypsin - breaks starch

  5. Lipase - protects inner lining of stomach
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct answer as bile salts are made in liver and they help emulsify or break down the fats or lipids present in the food so that it makes it easy for the enzymes to act and digest them.

Multiple choice

Food is churned in the stomach for about three hours and broken into a semi-solid paste. The tubular glands present in the stomach secrete gastric juice. Which of the following substances are contained in this gastric juice?

  1. Amylase, pepsin and mucus

  2. Amylase, hydrochloric acid and mucus

  3. Hydrochloric acid, pepsin and amylase

  4. Mucus, hydrochloric acid and pepsin

  5. Pepsin and hydrochloric acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer. Gastric juices contain hydrochloric acid, pepsin and mucus.

Multiple choice

Match the following: Types of cells|Functions| |a. Mucus cells|1. They secrete a proenzyme of protein digestive enzyme.| |b. Zymogen cells|2. They secrete hydrochloric acid activating pepsinogen into functional pepsin.| |c. Parietal cells|3. They secrete mucus for lubricating the food.|

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

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

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

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

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

 Mucus cells secrete mucus for lubricating the food. Zymogen cells secrete a proenzyme of protein digestive enzyme. Parietal cells secrete hydrochloric acid activating pepsinogen into functional pepsin.

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 process by which the blood carries the absorbed food products to the tissue cells, where they are taken up, is called

  1. digestion

  2. ingestion

  3. assimilation

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

The assimilation process of digested food in humans is very much complex as the digested food has to be utilized in a very proper way that can help human to live healthy life. The products of the digestion are finally absorbed through the lining of small intestine into the blood stream and become a part of the cell components, this is called assimilation. Blood carries these products to each and every part of the body. On reaching the cells they either take part in the synthesis of carbohydrates, proteins and fats of the human tissue or are metabolized to generate energy in the form of ATP which is used when required.

Multiple choice

What function is performed by enterokinase?

  1. It converts trypsinogen to trypsin.

  2. It converts caesin to caesinogen.

  3. It converts pepsinogen to pepsin.

  4. It converts proteins to peptides.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This function is performed by enterokinase.

Multiple choice

What is common among amylase, trypsin and renin?

  1. These are all proteins.

  2. These are all proteolytic enzymes.

  3. These act at pH less than 7.

  4. These are all produced in the stomach.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

These are enzymes. Hence, these are all proteins.