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 about nutrition in amoeba is/are incorrect?

a. The enzymes present in vacuole break down the food. b. The food becomes soluble inside the cytoplasm in amoeba. c. The cytoplasm disappears after absorption of food.

  1. only a

  2. only b

  3. only c

  4. only a and c

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

This is the correct answer as all the statements are incorrect. 

Digestive enzymes present in the cytoplasm enter the food vacuole to break the food down. The digestion takes place inside the food vacuole due to which the food becomes soluble. The food vacuole disappears after the absorption of food in amoeba.

Multiple choice

Which of the following is the largest part of the alimentary canal?

  1. Food pipe

  2. Large intestine

  3. Stomach

  4. Small intestine

  5. Diaphragm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The small intestine is a long, highly convoluted tube in the digestive system that absorbs about 90% of the nutrients from the food we eat. It is given the name because it is only 1 inch in diametre, making it less than half the diametre of the large intestine. The small intestine is, however, about twice the length of the large intestine and usually measures about 10 feet in length.

Multiple choice

The liver stores the digested food as

  1. starch

  2. glucose

  3. glycogen

  4. feces

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

This is the correct answer as the liver stores the digested food, that is not immediately used by the body, as glycogen.

Multiple choice

Which of the following is the function of salivary amylase?

  1. It begins the digestion of the proteins present in the food to form smaller molecules.

  2. It makes the medium of gastric juice acidic, so that proteins can be digested properly.

  3. It kills the bacteria which may enter the stomach with food.

  4. It contains salts which help to emulsify or break fats present in the food.

  5. It digests the starch present in food into sugar.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer. The human saliva contains an enzyme called salivary amylase and the function of this enzyme is to digest the starch present in food into sugar.

Multiple choice

Which one of the following is an alkaline substance that helps break the fats present in the food into small globules making it easy for digestion?

  1. Bile

  2. Hydrochloric acid

  3. Mucus

  4. Saliva

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

This is the correct answer. Bile is a fluid that is made and released by the liver and stored in the gall bladder. It helps with digestion. It helps enzymes in our body to break down fats into fatty acids, which can be taken into the body by the digestive tract.

Multiple choice

Which of the following statements is correct about sphincter muscle in the stomach?

  1. It helps protect the stomach wall from its own secretions of hydrochloric acid.

  2. It aids in the contraction and expansion movements of the food pipe.

  3. It helps the tubular glands in the stomach walls to secrete the gastric juices.

  4. It helps in the exit of food from the stomach to the small intestine.

  5. It aids in the release of bile in the stomach.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer. The exit of food from the stomach is regulated by the sphincter muscle in the stomach. It releases food in small amounts to the small intestine.

Multiple choice

Which of the following statements is/are correct?

a. Small intestine receives secretions from liver and pancreas. b. Pancreas is a large gland that lies beneath the stomach. c. Pancreas secretes bile into the small intestine.

  1. a only

  2. b only

  3. c only

  4. a and b

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

This is the correct answer. Small intestine receives secretions from two glands namely, pancreas and liver. Pancreas is a large gland that lies parallel to and beneath the stomach.