Biology · 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 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

Ejection of stomach contents through the mouth is called _______.

  1. diarrhoea

  2. constipation

  3. vomiting

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

Ejection of stomach contents through the mouth is called 'vomiting'.

So the correct option is C.

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

Which of the following statements is incorrect?

  1. Faecal accumulation in the rectum initiates a neural reflex causing an urge for its removal

  2. Irregular bowel movements cause constipation.

  3. In diarrhoea absorption of food is increased.

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In diarrhoea, absorption of food is reduced. So, the correct answer is (c)

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

A disorder called jaundice is primarily associated with 

  1. Skeletal system

  2. Nervous system

  3. Excretory system

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

Jaundice is a viral disease. It caused by hepatitis virus A, B, C and D. Hepatitis virus causes the liver inflammation. As the old red blood cells travel to the liver, where they are broken down, from the red blood cells broken a yellow coloured pigment is released called bilirubin. When the bilirubin level rises in the liver and it affects the bile duct, which affects the digestive system. 

So, the correct answer is 'Digestive system'

Multiple choice evs from tasting to digestion balanced diet and malnutrition assimilation of food components and importance of food science of kitchen

Which of the following activities improves digestion?

  1. Swallowing

  2. Chewing

  3. Dehydration

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Chewing is an important step in digestion. It helps in breaking down of food mechanically into finer texture and thus increase surface area of food for the action of saliva. Hence it improves digestion.
So, the correct answer is 'Chewing'.
Multiple choice evs from tasting to digestion balanced diet and malnutrition assimilation of food components and importance of food science of kitchen

The major utility of breaking up of food into small bits during chewing is

  1. To reduce surface area of the food eaten up

  2. To increase surface area of the food eaten up

  3. To make the food soluble

  4. To enjoy taste of food
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chewing breaks the large food particles into the small. The mechanical digestion of food in the mouth involves converting bite-sized pieces of food into smaller particles. This has the effect of increasing the surface area of the food particles and allowing saliva to be thoroughly mixed with them.

So, the correct answer is 'To increase the surface area of the food eaten up'.

Multiple choice zoology endocrine system and chemical co-ordination mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

The stomach pain impulses are received by receptors known as

  1. Proprioreceptors

  2. Exteroreceptors

  3. Visceral receptors

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

a) Proprioceptors are the mechanoceptors which are activated by changes in pressure or movement and are involved in maintaining muscle tone, body equilibrium and posture. 

b) Exteroreceptors are the one that is activated by stimulus from external environments. This includes photoreceptors of eye and mechanoreceptors of inner ear. Stomach pain is an internal stimulus. 
c) Receptors which are present in internal organs and are activated by internal stimuli are known as visceral receptors. 
d) Chemoceptors are the specialized receptors for taste and smell which are activated by changes in the chemical concentration of the substances. 

Multiple choice biology chemical coordination and integration mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

Which among the following is the correct example of negative feedback?

  1. Regulation of blood calcium level

  2. Saliva secretion

  3. Secretion of pancreatic amylase

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A- Levels of parathyroid hormone are regulated by a negative feedback loop by increasing blood calcium levels which further prevents the release of parathyroid hormone.

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

Prothrombin is found in

  1. Intestine and helps in cellulose digestion

  2. Liver and helps in production of bile

  3. Blood and gives red colour to blood

  4. Blood and helps in blood clotting
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Prothrombin is a plasma protein which is converted into thrombin in the presence of thromboplastin released by platelets at the site of injury. The thrombin then converts protein fibrinogen into insoluble fibrin and thus aids in blood clotting. 

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 digestive system of human assimilation of food and egestion assimilation of food components and importance of food

Which of the following statement is INCORRECT in case of defaecation in the human body?

  1. Defaecation involves both voluntary and involuntary process

  2. Voluntary contractions of abdominal muscles and diaphragm aid in defaecation

  3. Decrease in intra abdominal pressure aids in the process of defaecation

  4. Distention of rectal wall induces defaecation reflex
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Defaecation is the process in which removal of fecal matter outside the body. It involves:-

1)Both voluntary and involuntary process the signal provided can be controlled by the person.
2)Voluntary contractions of abdominal muscles and diaphragm aid in defaecation.
3)Increase in intra abdominal pressure aids in the process of defaecation.
4)Distention of rectal wall induces defaecation reflex.
So the correct option is 'Decrease in intra abdominal pressure aids in the process of defaecation'.

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'.