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 soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

Thrombin occurs in vertebrates in 

  1. The blood and gives it red colour

  2. The blood and is important for clotting

  3. The liver and is important for bile secretion

  4. The stomach and digests proteins
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Thrombin is a substance formed in one of the steps of clotting process from prothrombin. Thrombin, in turn, converts fibrinogen into fibrin which ultimately forms a clot. 
Thus, the correct answer is option B. 
Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

In human, the prothrombin required for blood clotting is produced in 

  1. Liver

  2. Stomach

  3. Pancreas

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

In human, the prothrombin required for blood clotting is produced in the liver in the presence of vitamin K. It gets converted into thrombin in the presence of thromboplastin and thus forms an essential step in the clotting process. 

Therefore, the correct answer is option A.

Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

Which enzyme induces lysis of fibrinogen to fibrin during fibrinolysis?

  1. Plasmin

  2. Thrombin

  3. Fibrin

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

Blood-clotting proteins circulate in the blood plasma in an inactive form, poised to participate in blood coagulation upon tissue injury. Blood-clotting proteins generate thrombin, an enzyme that converts fibrinogen to fibrin, and a reaction that leads to the formation of a fibrin clot.

Therefore, the correct answer is option B.

Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

Enzyme causing lysis of fibrin during fibrinolysis is

  1. Fibrinogen

  2. Plasmin

  3. Thrombin

  4. VIII Platelet factor
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fibrinolysis is a process that prevents blood clots from growing and becoming problematic. This process has two types: primary fibrinolysis and secondary fibrinolysis. The primary type is a normal body process, whereas secondary fibrinolysis is the breakdown of clots due to a medicine, a medical disorder, or some other causes. In fibrinolysis, a fibrin clot, the product of coagulation, is broken down. Its main enzyme plasmin cuts the fibrin mesh at various places, leading to the production of circulating fragments that are cleared by other proteases or by the kidney and liver. Hence Enzyme causing lysis of fibrin during fibrinolysis is plasmin.

So, the correct answer is 'Plasmin'.

Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

Which proteolytic enzyme induces lysis of fibrin during fibrinolysis?

  1. Fibrin

  2. Thrombin

  3. Plasmin

  4. Platelet factor VIII
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plasmin is the proteolytic enzyme that induces lysis of fibrin to fibrin degradation products during fibrinolysis (enzymatic breakdown of fibrin during blood clots)

So, the correct answer is 'Plasmin'

Multiple choice zoology insects and human welfare bee keeping apiculture apiculture, sericulture and fisheries

The name 'honey stomach' in bees is applied for

  1. Gizzard

  2. Pharynx

  3. Stomach

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

The crop also called as honey stomach or honey sack is a specialized part of foregut. It is similar to distensible sack. The main function of the crop is transport and storage of liquid food (water, nectar and honeydew). Another function of crop is uptake of water from its lumen. 

Therefore, the correct answer is option D.

Multiple choice biology digestive system of human assimilation of food and egestion assimilation of food components and importance of food

Which of the following is not constituent of faeces of a healthy individual?

  1. Dead mucosal cells

  2. Cholesterol

  3. Fat

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

Faces of a healthy person contain a small amount of metabolic waste products like bilirubin and biliverdin that provides colour to it, dead mucosal cells from the lining of the gut, little amount of cholesterol, fat etc.

So the correct option is 'Glucose'.

Multiple choice biology digestive system of human assimilation of food and egestion assimilation of food components and importance of food

Constipation is a condition in which defecation occurs inky at prolonged intervals. It is irregular or inadequate defecation. Which of the following conditions is not responsible for constipation?

  1. Decreased colon motality

  2. A diet containing too little fluid and fibre

  3. Haemorrhoids

  4. Too much absorption of water by colon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Haemorrhoids are also known as piles.
  •  In Haemorrhoids, swellings contain enlarged blood vessels found inside or around the bottom (the rectum and anus). 
  • A lump hanging down outside of the anus, which may need to be pushed back in after passing a stool. a mucus discharge after passing a stool.
  • Hence, Constipation is a condition in which defecation occurs inky at prolonged intervals. It is irregular or inadequate defecation. Haemorrhoids is not responsible for constipation.
  • So, the correct answer is 'Haemorrhoids'.
Multiple choice biology digestive system of human assimilation of food and egestion assimilation of food components and importance of food

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

  1. Absorption

  2. Assimilation

  3. Digestion

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

After digestion of complex food into the simple soluble form, the nutrients are absorbed by the small intestine with help of finger-like projection (villi) in the wall of the intestine. The wall of intention is surrounded by the blood vessels which possess assimilation of food. Assimilation is the process of transfer of soluble food from the intestine to different parts of the body through blood.

Therefore, the correct answer is option B.

Multiple choice biology digestive system of human assimilation of food and egestion assimilation of food components and importance of food

Fatty acid and glycerol are transported from intestine mainly through

  1. Hepatal portal system

  2. Lymphatic system

  3. Central nervous system

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

  1. Assimilation means the absorption and digestion of food or nutrients by the body or any biological system. 
  2. Assimilation of fats results in the formation of the end products of digestion of fats ie fatty acids and glycerols.
  3. These are absorbed and taken into the lacteal and later the lymphatic system and then they are transferred to the liver. 
  4. Fatty acid and glycerol can be used to form fats which are stored in the body’s fat deposits e.g. under the skin in the adipose tissue. Hence, the fatty acid and glycerol are transported from intestine mainly through the lymphatic system.
So, the correct answer is the 'lymphatic system'.

Multiple choice biology digestive system of human assimilation of food and egestion assimilation of food components and importance of food

Greenish fecal matter passed by infant in first two days of birth is due to sterilized intestine is 

  1. Macrophage

  2. Stercobilin

  3. Meconium

  4. Both (b) and (c)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The first intestinal discharge from newborns is meconium, which is a viscous, dark-green substance composed of intestinal epithelial cells, lanugo, mucus, and intestinal secretions (eg, bile). Intestinal secretions, mucosal cells, and solid elements of swallowed amniotic fluid are the 3 major solid constituents of meconium. Water is the major liquid constituent, comprising 85-95% of meconium. Meconium is sterile and does not contain bacteria.

Multiple choice biology digestive system of human assimilation of food and egestion assimilation of food components and importance of food


Faeces in the body is stored in

  1. duodenum

  2. ileum

  3. rectum

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

Food is broken down in the digestive tract until it passes all the way through the small and large intestine and is stored in the rectum as the stool. The body has a system for sending a signal when the rectum is full and needs to be emptied

So, the correct option is 'rectum'

Multiple choice evs science of kitchen assimilation of food and egestion assimilation of food components and importance of food busy at work - our internal organs

A condition in which feces are discharged from the bowel frequently and in liquid for 

  1. Pneumonia

  2. Diarrhea

  3. Typhoid

  4. Malaria
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Diarrhea is the frequent passage of loose, watery, soft stools with or without abdominal bloating, pressure, and cramps. People of all ages can suffer from diarrhea, it can be caused by viruses or bacteria. Most common symptom is watery, liquid stool. Along with this, there are abdominal cramps, fever, bloating, dehydration etc.
Therefore, the correct answer is option B.