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 zoology endocrine system and chemical co-ordination gastrointestinal tract and liver hormones of heart, kidney, liver and gastrointestinal tract coordination in human beings- chemical control

A child took sugarcane and sucked its juice. Regarding this which of the following match is correct? 
Substrate      Enzyme       Site of secretion of enzyme         Products formed

  1. Protein's- Pepsin, Duodenum,Polypeptides

  2. Starch- Amylase, Salivary glands, Glucose

  3. Lipids- Lipase, Pancreas Fat globules

  4. Sucrose -Invertase, Duodenum, Glucose + fructose
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The correct answer is (d).

Multiple choice zoology endocrine system and chemical co-ordination gastrointestinal tract and liver hormones of heart, kidney, liver and gastrointestinal tract coordination in human beings- chemical control

Cholecystokinin is secretion of 

  1. Duodenum, that causes contraction of gall bladder.

  2. Goblet cells of ileum stimulates secretion of succus entricus.

  3. Liver and controls secondary sex characters.

  4. Stomach that stimulates pancreas to release juice.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cholecystokinin (CCK), formerly called pancreozymin, is a digestive hormone released with secretin, when food from the stomach reaches the duodenum. Cholecystokinin causes contraction of the gallbladder, which forces bile into the duodenum.

Multiple choice zoology endocrine system and chemical co-ordination gastrointestinal tract and liver hormones of heart, kidney, liver and gastrointestinal tract coordination in human beings- chemical control

Secretin

  1. Stimulates enzymes secretion by pancreas, inhibits acid secretion in stomach, stimulates gall bladder

  2. Stimulates bicarbonate secretion by pancreas, inhibits acid secretion in stomach, stimulates bicarbonate secretion by liver

  3. Stimulates acid secretion in stomach, potentiates action of CCK, inhibits intestinal movement

  4. Stimulates gall bladder, stimulates bicarbonate secretion by pancreas
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Secretin stimulates the release of a watery bicarbonate solution from the pancreatic and bile duct epithelium. Secretin increases water and bicarbonate secretion from duodenal Brunner's glands to buffer the incoming protons of the acidic chyme. It also enhances the effects of cholecystokinin to induce the secretion of digestive enzymes and bile from pancreas and gallbladder, respectively.

Multiple choice zoology endocrine system and chemical co-ordination gastrointestinal tract and liver hormones of heart, kidney, liver and gastrointestinal tract coordination in human beings- chemical control

Which of the following belongs to the class of pepsin and trypsin?

  1. Secretin

  2. Gastrin

  3. Rennin

  4. Steapsin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Chymosin, known also as rennin, is a proteolytic enzyme related to pepsin that synthesized by chief cells in the stomach of some animals. Its role in digestion is to curdle or coagulate milk in the stomach, a process of considerable importance in the very young animal.
So, the correct option is 'Rennin'.
Multiple choice zoology our health harmful microorganism for humans microbes and diseases categories of diseases

Condition in which inflammation of vermiform appendix of the digestive system occurs is 

  1. Amoebic dysentery

  2. Appendicitis

  3. Intestinal cancer

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

Appendicitis or epityphlitis is inflammation of the vermiform appendix. The inflamed appendix is filled with pus and causing pain. The symptom of appendicitis includes abdominal pain, nausea, vomiting and decreased appetite. 

Multiple choice

Where does the majority of protein digestion take place?

  1. Stomach

  2. Small intestine

  3. Large intestine

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

The majority of protein digestion occurs in the small intestine, where pancreatic enzymes and enzymes produced by the intestinal cells break down proteins into amino acids.

Multiple choice

Which of the following enzymes is responsible for the digestion of fats?

  1. Lipase

  2. Amylase

  3. Protease

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

Lipase is an enzyme that breaks down fats into fatty acids and glycerol.

Multiple choice

Which of the following nutrients is absorbed primarily in the small intestine?

  1. Carbohydrates

  2. Proteins

  3. Fats

  4. Vitamins and minerals
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

All of the macronutrients (carbohydrates, proteins, and fats) and micronutrients (vitamins and minerals) are absorbed primarily in the small intestine.

Multiple choice

What is the role of bile in the digestion and absorption of fats?

  1. It breaks down fats into fatty acids and glycerol.

  2. It emulsifies fats, making them easier to digest.

  3. It absorbs fats from the small intestine.

  4. It stores fats until they are needed by the body.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bile, produced by the liver and stored in the gallbladder, emulsifies fats, breaking them down into smaller droplets, which increases the surface area for lipase to work on.

Multiple choice

What is the role of the pancreas in the digestion and absorption of nutrients?

  1. It produces enzymes that help digest carbohydrates, proteins, and fats.

  2. It produces bile that helps digest fats.

  3. It absorbs nutrients from food.

  4. It stores food until it is ready to be digested.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pancreas produces enzymes such as amylase, lipase, and protease, which help digest carbohydrates, fats, and proteins, respectively.

Multiple choice

What is the medical term for involuntary defecation?

  1. Enuresis

  2. Encopresis

  3. Nocturia

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

Encopresis is the medical term for involuntary defecation, which is a common childhood disorder.

Multiple choice

What is the most common type of encopresis?

  1. Retentive encopresis

  2. Overflow encopresis

  3. Diurnal encopresis

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

Retentive encopresis is the most common type of encopresis, which occurs when a child holds their stool in for too long.

Multiple choice

What is the term for the process of breaking down food into smaller molecules?

  1. Digestion

  2. Absorption

  3. Metabolism

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

Digestion is the process of breaking down food into smaller molecules. It involves the mechanical breakdown of food by chewing and the chemical breakdown of food by enzymes.

Multiple choice

What is the role of amylase in saliva?

  1. Digestion of proteins

  2. Digestion of carbohydrates

  3. Digestion of fats

  4. Neutralization of acids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Amylase is an enzyme present in saliva that breaks down carbohydrates, particularly starch, into smaller sugar molecules, initiating the process of carbohydrate digestion.

Multiple choice

What is the term for the stomach lining of an animal used as food?

  1. Tripe

  2. Rumen

  3. Omasum

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

Tripe is the stomach lining of an animal, particularly a cow, and is often used in soups and stews.