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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181. Erepsin acts upon:
- A. Polypeptides
- B. Carbohydrates
- C. Dipeptides
- D. Fats
Explanation: Erepsin consists of many enzymes and works best in alkaline pH. It doesn't act upon proteins but does act upon lower peptides such as…
Correct answer: Dipeptides- A. Gastrin
- B. Cholecystokinin
- C. Secretin
- D. Renin
Explanation: When stimulated by the cholecystokinin (CCK), the gallbladder contracts pushing bile through the cystic duct and into the common bile duct.
Correct answer: Cholecystokinin- A. Mucus cells
- B. Parietal cells
- C. Hormonal cells
- D. Chief cells
Explanation: Pepsinogens are synthesized and secreted primarily by the gastric chief cells of the human stomach before being converted into the…
Correct answer: Chief cells- A. Throat
- B. Pharynx
- C. Medulla oblongata
- D. Stomach
Explanation: The swallowing process is primarily regulated by the medulla oblongata, which is part of the brainstem.
Correct answer: Medulla oblongata- A. Obesity
- B. Bulimia nervosa
- C. Dyspepsia
- D. Anorexia nervosa
Explanation: Bulimia nervosa is characterized by recurrent episodes of binge eating, wherein individuals consume large amounts of food, often high in…
Correct answer: Bulimia nervosa- A. 10-20 Acinars
- B. 20-40 Acinars
- C. 20-30 Acinars
- D. 30-40 Acinars
Explanation: The pancreatic acinar cell is a highly specialised structure developed for synthesis, storage, and secretion of digestive enzymes.
Correct answer: 20-40 Acinars- A. Kupffers cells
- B. Hansans cells
- C. Lupffers cells
- D. Aciner cells
Explanation: The cells in the liver that are associated with phagocytosis are called Kupffer cells.
Correct answer: Kupffers cells- A. Duodenum
- B. Jejunum
- C. Ileum
- D. Colon
Explanation: Option A is correct. The first segment of the small intestine is the duodenum.
Correct answer: Duodenum