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 biology human health and disease drug, tobacco and alcohol consumption addiction and dependence community health and hygiene

The most specific indication in case of cirrhosis of liver cells is the increase in the level of which enzyme?

  1. CoA

  2. SGPT

  3. LDH

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

Alanine aminotransferase (ALT) or serum glutamate pyruvate aminotransferase (SGPT) is the enzyme produced by liver cells. It helps the body metabolize proteins. Cirrhosis is the disease in which normal liver cells are replaced by scar tissue caused by alcohol and viral hepatitis B and C. If the liver is damaged as in cirrhosis, SGPT is released into the blood and this causes SGPT levels to increase.
Thus, the correct answer is option (B), 'SGPT'.

Multiple choice evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Entamoeba gingivalis lives in the

  1. Intestine

  2. Colon

  3. Pus pockets of pyorrhoea

  4. Intestine and colon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Entamoeba gingivalis is a protozoan endoparasite, residing in the tartar and pus pockets of teeth of pyorrhoea infected human beings. It is the first parasitic amoeba known to human beings. 

Therefore, the correct answer is option C.

Multiple choice evs structure and functions of living organisms -ii experiments on digestive enzymes role of receptors in the mouth types of teeth introduction to human digestive system circulatory system and organs

Teeth are the only part of the digestive system that physically breaks down food.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • The digestive glands (salivary glands, pancreas, liver, and gallbladder) produce or store secretions that the body carries to the digestive tract in ducts and breaks down chemically. 
  • The teeth help in mechanical digestion by masticating (chewing) food.
  •  The whole process starts in the oral cavity, where the saliva from the salivary glands mixes with the food and starts to begin the breakdown of food. This semi-digested food then travels down to the small intestine, where secretions from the liver, gallbladder, and pancreas further act on the food particles. Hence, Teeth are not only part of the digestive system that physically breaks down food.
So, the correct answer is 'False'.

Multiple choice biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

Saliva contains .......... enzyme which hydrolyses starch into 

  1. Hydrolase, maltase

  2. Amylase, maltose

  3. Amylose, kinase

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

The digestion of food begins at the mouth where the saliva is secreted by the salivary gland that contains an enzyme called as salivary amylase enzyme which hydrolyzes starch into maltose but the complete digestion of starch occurs only in the small intestine by the action of pancreatic amylase. 

Multiple choice biology coordination in life processes experiments on digestive enzymes role of receptors in the mouth types of teeth

Emulsification of facts is done by-

  1. Saliva

  2. bile

  3. gastric juices

  4. intestinal juices
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chemical digestion takes place as lingual lipase, an enzyme in your saliva, begins to emulsify fat and saliva moistens the food to make it easier to swallow. When the food reaches your stomach, the muscles there begin to churn and move to further break it down. So the correct option is 'Saliva'.

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

The yellow-coloured milk secreted by cattle soon after the birth of a calf is called as 

  1. Chyme

  2. Chyle

  3. Cholesterol

  4. Colostrum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The yellow-coloured milk secreted by cattle soon after the birth of a calf is called as colostrum. It is rich in antibodies that confer passive immunity to the newborn

So, the correct answer is 'Colostrum'

Multiple choice zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

While eating, hiccups are because of

  1. Spicy food

  2. Food particles which enter the wind pipe

  3. Food particles enter the food pipe

  4. Any infection in the throat
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hiccups occur due to hasty eating or wrong posture during the meal which allows the food particles to enter the windpipe. The windpipe carries air from the nostrils to the lungs. It runs adjacent to the food pipe. But inside the throat, air and food share a common passage. During the act of swallowing a flap-like valve closes the passage of the windpipe and guides the food into the food pipe. If by chance,food particles enter the windpipe, hiccups can be experienced.

So, the correct answer is option B.

Multiple choice zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

Identify the incorrect pair from the following.

  1. Pharynx- Oesophagus

  2. Jejunum- Colon

  3. Colon- Rectum

  4. Stomach- Duodenum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The jejunum is the second part of the small intestine in humans and most higher vertebrates, including mammals, reptiles, and birds. The jejunum lies between the duodenum and the ileum.
Pharynx is part of the digestive system and also of the conducting zone of the respiratory system.
The colon is also called as the large intestine.
Stomach is the internal organ in which the major part of the digestion of food occurs, being (in humans and many mammals) a pear-shaped enlargement of the alimentary canal linking the oesophagus to the small intestine.
Therefore, the correct answer is option B.
Multiple choice biology diseases and hygiene diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Pigs get infected with Taenia by swallowing

  1. Human faeces

  2. Human faeces with embryophores

  3. Human faeces with hexacanth

  4. Human faeces with onchospheres
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pigs become intermediate hosts for the tapeworm Taenia solium by ingesting human feces containing the eggs (onchospheres), which then develop into cysticerci in the pig's muscles.

Multiple choice biology diseases and hygiene diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Pigs get infected with Taenia by swallowing 

  1. Human faeces with eggs

  2. Human faeces with embryophores

  3. Human faeces with hexacanth

  4. Human faeces with onchospheres
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

If a human gets infected with tapeworm, it's faeces contains tapeworm eggs. If such infected human faeces are consumed by pigs, then they too get infected with tapeworm infection.

So, option D is the correct answer.

Multiple choice evs science of kitchen balanced diet and malnutrition assimilation of food components and importance of food skeletal system and muscles assimilation of food and egestion busy at work - our internal organs

In acute constipation, the faces are retained within the rectum as bowel movements occur irregularly, purgatives containing (A)  are generally used as they B  fluidity and volume of intestinal contents by drawing water from the blood into intestinal lumen by C.

  1. A - Magnesium; B - increase; C - endosmosis

  2. A- Sodium salt; B - decrease; C- exosmosis

  3. A - Magnesium; B - increase; C - exosmosis

  4. A - Potassium salt; B - decrease; C- endosmosis

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Constipation is a condition in which feces are retained within rectum as bowel movements occur irregularly. It is caused mainly due o poor diet and dehydration. Purgatives containing magnesium can be used to treat constipation. It is an osmotic laxative that increases the fluidity and volume of intestinal contents by drawing water from blood into intestinal lumen by endosmosis.
So the correct option is 'A- Magnesium; B - saltincrease; C- endosmosis'.
Multiple choice evs science of kitchen balanced diet and malnutrition assimilation of food components and importance of food skeletal system and muscles assimilation of food and egestion busy at work - our internal organs

Ability of digesting milk decreases with age due to the lack of 

  1. lactase

  2. pepsin

  3. rennin

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

Lactase is the enzyme required to break down lactose, the sugar found in milk. Its production often decreases with age, leading to lactose intolerance.

Multiple choice evs science of kitchen balanced diet and malnutrition assimilation of food components and importance of food skeletal system and muscles assimilation of food and egestion busy at work - our internal organs

Infrequent bowel movement is

  1. Constipation

  2. Vomitting

  3. Loose mothion

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Infrequent bowel movement or tough bowel movements causes constipation. In this condition the feces is hardened. The main reasons of constipation are irritable bowel syndrome, uptake of antacid medicines, colon cancer, pregnancy, stress, unusual life style etc. So, the correct option is A.