Free Human Digestive System MCQs with Answers
188 Human Digestive System MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The human digestive system breaks food into absorbable molecules through mechanical processing, enzyme action and chemical conditions along the alimentary canal. Questions cover the mouth, stomach, small and large intestines, liver, pancreas and associated secretions, including the digestion and absorption of carbohydrates, proteins, lipids, vitamins, minerals and water.
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188 questions · page 8 of 10
- A. Proteolytic enzyme action
- B. Dissolving in mucus
- C. Hormonal action
- D. Hydrochloric acid
Explanation: Pepsinogen is converted into pepsin by hydrochloric acid.
Correct answer: Hydrochloric acid- A. Proteins
- B. Fats
- C. Carbohydrates
- D. Vitamins
Explanation: Digestion of carbohydrates begins in the oral cavity with the action of salivary amylase.
Correct answer: Carbohydrates- A. Trypsin
- B. Pepsin
- C. Protease
- D. All of these
Explanation: The enzymes mentioned above, are the enzymes that break down protein into simpler forms.
Correct answer: All of these- A. Cardiac Sphincter
- B. Esophageal Sphincter
- C. Ileocolic Sphincter
- D. Pyloric Sphincter
Explanation: Explanation:The junction between esophagus and stomach is known as cardiac sphincter.
Correct answer: Cardiac Sphincter- A. Enterokinase
- B. Chyme
- C. Lipase
- D. Erypsin
Explanation: Explanation:Like Pepsin, trypsin is also secreted as inactive trypsinogen, which is activated by enterokinase.
Correct answer: Enterokinase- A. Digestion of triglycerides
- B. Digestion of lipids
- C. Digestion of all types of food
- D. Digestion of carbohydrates
Explanation: Option [A] Gastric Lipase breaks down fats in the stomach.Option [B] Lipase breaks down Lipids into fatty acids and glycerol.Option[C]…
Correct answer: Digestion of carbohydrates- A. At the junction of esophagus and stomach
- B. At the junction of stomach and small intestine
- C. At the junction of ileum and large intestine
- D. At the junction of small intestine and large intestine
Explanation: Option[A] cardiac sphincter is present at the junction of esophagus and stomach.Option[B] pyloric sphincter is present at the junction of…
Correct answer: At the junction of ileum and large intestine- A. Obesity
- B. Anorexia nervosa
- C. Dyspepsia
- D. Bulimia nervosa
Explanation: Option[a] Obesity is defined as the accumulation of abnormal or excessive fat that may impair health.Option [b] Anorexia nervosa is an…
Correct answer: Anorexia nervosa- A. Liver
- B. Kidney
- C. Nephron
- D. Glomerulus
Explanation: Option [a] Liver plays a central role in all metabolic processes in the body.
Correct answer: Liver- A. Amylase
- B. Lipase
- C. Enterokinase
- D. Pepsin
Explanation: [A] Amylase is release in mouth in active form[B] Lipase is released in pancreatic juice to break down fats[C] Enterokinase is a protease…
Correct answer: Pepsin- A. Secretin
- B. Pepsinogen
- C. Gastrin
- D. Both Gastrin and Secretin
Explanation: [A] Secretin is a hormone released by duodenum which stimulates secretion by the liver and pancreas[B] Pepsinogen is released in stomach…
Correct answer: Secretin- A. Hard Palate
- B. Soft Palate
- C. Epiglottis
- D. Larynx
Explanation: Option [A] hard palate plays a significant role as it separates the oral cavity from the nasal cavity and aiding swallowing and…
Correct answer: Soft Palate153. Beri Beri is due to:
- A. Metabolic disorder
- B. Chemical causes
- C. Nutritional deficiency
- D. Mental Illness
Explanation: Option A is incorrect since a metabolic disorder occurs when the metabolism process fails whereas beri beri is caused by deficiency of…
Correct answer: Nutritional deficiency- A. Bolus
- B. Bolus or chyme
- C. Mucus
- D. Chyme
Explanation: After food enters the stomach, the muscular walls of the stomach contract and mix the food with gastric juices, breaking it down into a…
Correct answer: Chyme- A. Goblet cells
- B. Absorptive cells
- C. Enterokinase
- D. Peptidase
Explanation: Enterokinase, also known as enteropeptidase, converts inactive trypsinogen into active trypsin in the duodenum, where it helps in protein…
Correct answer: Enterokinase- A. Pepsinogen, Pepsin
- B. Pepsinogen, Trypsin
- C. Trypsinogen, Trypsin
- D. Chymotrypsinogen, Chymotrypsin
Explanation: The correct answer is Trypsinogen is activated to Trypsin by Enterokinase, which is an enzyme secreted by the lining of the duodenum.
Correct answer: Trypsinogen, Trypsin- A. Pepsin
- B. Pepsinogen
- C. Gastrin
- D. HCl
Explanation: HCL (Hydrochloric acid): This option is the correct answer. Oxyntic cells, also known as parietal cells, in the stomach are responsible…
Correct answer: HCl- A. Parietal Cells
- B. Goblet Cells
- C. Chief Cells
- D. Zymogen Cells
Explanation: Parietal cells (also known as oxyntic cells) are epithelial cells in the stomach that secrete hydrochloric acid (HCl).
Correct answer: Parietal Cells- A. Submucosa
- B. Mucosa
- C. Muscularis
- D. Serosa
Explanation: Mucosa is the innermost layer of the digestive tract and is responsible for secretion and absorption.
Correct answer: Mucosa- A. Glottis
- B. Tongue
- C. Cheeks
- D. Epiglottis
Explanation: The epiglottis is a leaf-shaped flap of cartilage located behind the tongue, at the top of the larynx.
Correct answer: Epiglottis