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 9 of 10
- A. Mucosa
- B. Visceral fat cells
- C. Mucus cells
- D. Oxyntic cells
Explanation: Since the other labeled cells are Zymogen cells (also known as acinar cells, which secrete digestive enzymes), the unlabeled cell type…
Correct answer: Oxyntic cells- A. 4
- B. 3
- C. 6
- D. 2
Explanation: Human salivary glands are divided into two main types: major salivary glands (parotid, submandibular, and sublingual) and numerous minor…
Correct answer: 6- A. Hepatic artery
- B. Hepatic vein
- C. Hepatic portal vein
- D. Hepatic portal artery
Explanation: The hepatic portal vein is the vessel that carries nutrient-rich blood containing digested food from the small intestine to the liver.
Correct answer: Hepatic portal vein- A. Amlyase
- B. Lipase
- C. Hydrochloric Acid
- D. Trypsin
Explanation: Pancreatic juice composition. Pancreatic juice is composed of water, mineral salts, enzymes, amylase, lipase, inactive enzyme precursors…
Correct answer: Hydrochloric Acid- A. Grasshoper and protozoa
- B. Grasshopper and frog
- C. Earthworm and protozoa
- D. Frog and protozoa
Explanation: Do you know what protozoans are? Yes, you do! They are single-cell organisms, just think if they are single-celled, why will they do…
Correct answer: Grasshopper and frog- A. Buccal chamber
- B. Intestine
- C. Rectum
- D. Intestinal caecum
Explanation: This needs a detailed analysis of the digestive system of earthworms.As this diagram shows esophagus opens into the intestine.
Correct answer: Intestine- A. Salivary gland
- B. Stomach
- C. Intestine
- D. Liver
Explanation: While bacteria are found in the mouth, they are not found within glands like the salivary gland. Therefore, A is incorrect.
Correct answer: Intestine- A. break down of cellulose
- B. synthesize some vitamins
- C. produce intestinal juice
- D. absorb water and mineral salts
Explanation: The large intestine is home to trillions of bacteria which are majorly involved in the production of vitamins (vit B1, B9, B7, B2, b5…
Correct answer: synthesize some vitamins- A. Canines
- B. Incisors
- C. Premolar
- D. Molar
Explanation: There are a total of 8 incisors found in both upper and lower jaws. Their primary function is to cut the food .There are two types of…
Correct answer: Incisors- A. Intestinal sac
- B. Typhlosole
- C. Oesophagus
- D. Pharyngeal mass
Explanation: The pharyngeal gland is made of chromophil cells, which produce saliva containing the proteolytic enzyme; protease, and mucin which…
Correct answer: Pharyngeal mass- A. Ptyalin
- B. Pepsin
- C. Diastase
- D. option missing
Explanation: Ptyalin aids in the digestion of starch in the mouth. Diastase breaks down starch into maltose in germinating seeds.
Correct answer: Ptyalin- A. Amylase
- B. Lipase
- C. Trypsinogen
- D. Insulin
Explanation: Option D is correct as pancreas is a heterocrine gland which also produces hormone named as insulin and glucagon which are produced by the…
Correct answer: Insulin- A. Liver
- B. Stomach
- C. Small intestine
- D. Large intestine
Explanation: Ammonia is formed during digestion in the large intestine, specifically the colon, through bacterial fermentation.
Correct answer: Large intestine- A. 1000ml/day
- B. 2000ml/day
- C. 3000ml/day
- D. 4000ml/day
Explanation: 1000ml/day: In a normal person, the liver produces between 800 to 1,000 milliliters of bile each day.
Correct answer: 1000ml/day- A. Renin
- B. Personage
- C. Rennin
- D. Gastrin
Explanation: Rennin, also known as chymosin, is the correct answer. It is an enzyme found in the gastric juice of many infant mammals, including…
Correct answer: Rennin- A. Buccal chamber
- B. intestine
- C. rectum
- D. intestinal caccum
Explanation: In earthworms, the esophagus connects the pharynx to the crop and then continues to the gizzard.
Correct answer: intestine- A. Rennin
- B. Pepsinogen
- C. Gastrin
- D. Renin
Explanation: Rennin is an enzyme found in the gastric juice of many infant mammals, including humans, that helps to digest milk proteins.
Correct answer: Rennin- A. oesophagus
- B. mouth
- C. stomach
- D. duodenum
Explanation: The correct answer is the stomach. The stomach is crucial for mechanical digestion as it churns and mixes the food, breaking it down into…
Correct answer: stomach- A. Cholic acid
- B. Biliverdin
- C. Haemoglobin
- D. Both (A) and (B)
Explanation: Bile salts are synthesized in the liver from cholesterol-derived bile acids such as cholic acid.
Correct answer: Cholic acid- A. Stomach
- B. Duodenum
- C. Ileum
- D. Colon
Explanation: Brunner's glands are branched tubular mucus glands normally found in the mucosa and submucosa of the duodenum. Therefore the answer is B.
Correct answer: Duodenum