Biology ยท 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 incorrect?

a. Peristaltic movement moves food in all the digestive organs throughout the alimentary canal. b. Food is churned in stomach for three hours and is partially digested. c. Sphincter muscle moves food in small amounts into the stomach from the food pipe.

  1. a only

  2. b only

  3. c only

  4. a and c

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

This is the correct answer as this statement is incorrect. The exit of food from stomach is regulated by a sphincter muscle, which releases it in small amounts into the small intestine.

Multiple choice

Which of the following is correct about mucus?

  1. It is alkaline and contains salts which help to emulsify lipids.

  2. It makes the medium of gastric juice acidic so that enzyme pepsin can digest proteins.

  3. It breaks the fats present in food.

  4. It digests starch present in food to form sugar.

  5. It protects stomach wall from its own secretions of hydrochloric acid.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer. Mucus protects stomach wall from its own secretions of hydrochloric acid.

Multiple choice

Which of the following is the correct statement about the large intestine of the human body?

  1. The absorption of food occurs here.

  2. The assimilated food is stored here.

  3. It absorbs water from undigested food.

  4. It stores digested food that is not used immediately by the body.

  5. It stores faeces.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct answer as the villi present in the inner surface of the large intestine absorbs most of the water from the undigested food.

Multiple choice

Jaundice is a symptom of disease of _____.

  1. Kidney

  2. Liver

  3. Pancreas

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

Jaundice is caused by the buildup of bilirubin in the blood, which occurs when the liver cannot properly process red blood cells or when bile flow is obstructed. It is a classic symptom of liver diseases like hepatitis, cirrhosis, or liver failure. Kidney, pancreas, and thyroid disorders do not typically cause jaundice.

Multiple choice

Which of the following is not a process of digestive system?

  1. Digestion

  2. Excretion

  3. Assimilation

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

Steps involved in the digestive system are- ingestion, digestion, absorption, assimilation, and egestion. Excretion is not a process of the digestive system, but is a process of the excretory system.

Multiple choice

Bile is produced by

  1. pancreas

  2. gallbladder

  3. stomach

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

Liver produces bile, whereas pancreas secretes pancreatic juice and stomach produces HCl. The function of the gallbladder is to store the bile. So, option (4) is the correct answer.

Multiple choice

The inner lining of the stomach secretes

  1. saliva

  2. mucus

  3. intestinal juice

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

The inner lining of the stomach secretes mucus, which protects the inner membrane from the action of HCl.

Multiple choice

Which of the following activities will be affected if hydrochloric acid is not secreted by cells of the stomach?

  1. Absorption of water

  2. Digestion of proteins

  3. Absorption of carbohydrates

  4. Absorption of proteins
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The main function of HCl is to convert the pepsinogen (inactive form) to pepsin (active form). Pepsin is an enzyme which is involved in the breakdown of proteins. So, if HCl is not secreted, digestion of proteins cannot take place.