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

Enzyme pepsin manifests its activity in

  1. alkaline conditions

  2. acidic conditions

  3. the presence of mucus

  4. the presence of a cofactor
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Enzyme pepsin digests proteins. Pepsin is secreted by the stomach and requires acidic conditions to manifest its action.

Multiple choice

Which of the following functions is performed by the sphincter of Oddi?

  1. It prevents the entry of food back up the esophagus.

  2. It mediates movement of small intestine contents into the large intestine.

  3. It allows the content of stomach into duodenum.

  4. It controls the flow of digestive juices from ampulla of vater to the second part of duodenum.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Correct Answer: It controls the flow of digestive juices from ampulla of vater to the second part of duodenum.

Multiple choice

Which of the following is the characteristic of strawberry gallbladder?

  1. Benign growth on the gallbladder wall

  2. Inflammation of the gallbladder

  3. Change in the gallbladder wall due to excess cholesterol

  4. Presence of stones in the gallbladder
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Strawberry gallbladder is a change in the gallbladder wall due to excess cholesterol. It is also called cholesterolosis.

Multiple choice

Which of the following is the correct order of steps in the process of nutrition?

  1. Ingestion - Digestion - Absorption - Egestion - Assimilation

  2. Ingestion - Assimilation - Absorption - Digestion - Egestion

  3. Ingestion - Digestion - Absorption - Assimilation - Egestion

  4. Ingestion - Digestion - Assimilation - Absorption - Egestion

  5. Ingestion - Egestion - Absorption - Assimilation - Digestion
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct order. The food is first ingested through the mouth. It is then digested by breaking down in mouth cavity, stomach and small intestines. Then, the food is absorbed mainly by the small intestines. The absorbed food is then incorporated into the cell components in the process of assimilation. Lastly, the undigested food is excreted out in the process of egestion.

Multiple choice

Which of the following is the correct order of food flow in the alimentary canal?

  1. Oesophagus - Stomach - Small intestines - Large intestines - Rectum

  2. Oesophagus - Stomach - Small intestines - Rectum - Large intestines

  3. Oesophagus - Stomach - Large intestines - Small intestines - Rectum

  4. Oesophagus - Small intestines - Stomach - Large intestines - Rectum

  5. Stomach - Oesophagus - Small intestines - Large intestines - Rectum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct order of food flow in the alimentary canal. The masticated food from mouth reaches oesophagus from where it is pushed into the stomach. In stomach, the food is churned and converted into semi-solid paste which is then pushed into small intestines. In small intestines, the food is digested and absorbed. The undigested food is further passed into large intestines, where water is absorbed from the undigested food. The undigested waste is passed into rectum, where it is stored in semi-solid faeces.