Digestive System MCQs
Moving beyond the basic anatomy, the real work of digestion happens through specialized glands and complex biochemical processes. This second part of our Digestive System Quiz series dives deeper into the internal organs and the chemical reactions that fuel our bodies.
This 40-question set (Part 2) focuses on highly specific topics such as the functions of the Liver and Pancreas, the role of Salivary Glands, digestive enzymes (like Pepsin, Amylase, and Trypsin), and the blood supply to various digestive organs. Whether you are a science student or an exam aspirant, these MCQs will help you polish your understanding of human physiology.
Read Also: Human Digestive System Quiz - Part 1Challenge yourself with these advanced questions and check the detailed explanations for better clarity! 👇
Start Quizzes [MCQs]
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Q. 1: Length of the human's pancreas ?
A) About 12 - 15 cm
B) About 2 - 5 cm
C) About 20 - 50 mm
D) About 12 - 15 mm
EXPLANATION: Length of the human's pancreas = About 12 - 15 cm (4.7 -5.9 inches).
Q. 2: The amount of pancreatic juice which secrets per day ?
A) 70 - 100 mL
B) 500 mL - 1200 mL
C) 1.5 - 3 Liters
D) 700 µL - 900 µL
EXPLANATION: The amount of pancreatic juice which secrets per day is 1.5 - 3 Liters.
Q. 3: Correct pH of pancreatic juice is ?
A) 6.8
B) 7.8
C) 7.4
D) 9.0
EXPLANATION: The pH of pancreatic juice = 7.8.
Q. 4: Where are present submucosal brounar's glands ?
A) Stomach
B) Esophagus
C) Pancreas
D) Small intestine
EXPLANATION: Submucosal brounar's glands located in pancreas that maintains pH of pancreatic juice at 7.8.
Q. 5: Which of the following enzyme secreate from stomach's peptic cells ?
A) Amylase
B) Lipase
C) Pepsinogen
D) All of these
EXPLANATION: Pepsinogen is secreate from stomach's peptic cells.
Q. 6: Which of the following enzyme not secreate from pancreas ?
A) Amylase and Trypsinogen
B) Lipase and Chymotrypsinogen
C) Pepsin
D) Procarboxypeptidase and Nuclease
EXPLANATION: Pepsin is activated form of pepsinogen that secrets from stomach's peptic cells.
Q. 7: Which of the following is digested into stomach ?
A) Carbohydrates and fats
B) Only proteins
C) Carbohydrates, fats and proteins
D) Fats, proteins and nucleic acids
EXPLANATION: Only proteins are digested into stomach.
Q. 8: Which of the following are digested into lumen of small intestine ?
A) Carbohydrates and fats
B) Only proteins
C) Carbohydrates, fats and proteins
D) Carbohydrate, Fat, proteins, DNA-RNA
EXPLANATION: Carbohydrate, Fat, proteins and DNA-RNA (nucleic acids) are digested into lumen of small intestine.
Q. 9: How many pairs of salivary glands found in human ?
A) 2 pairs
B) 3 pairs
C) 4 pairs
D) 6 pairs
EXPLANATION: Number of 3 pairs of salivary glands found in human: First pair= Parotid glands, Second pair= Submandibular glands, Third pair= Sublingual glands.
Q. 10: Which of the following salivary glands is largest ?
A) Parotid glands
B) Submandibular glands
C) Sublingual glands
D) All of these
EXPLANATION: Parotid glands are the largest salivary glands.
Q. 11: Which of the following salivary glands is smallest ?
A) Parotid glands
B) Submandibular glands
C) Sublingual glands
D) All of these
EXPLANATION: Sublingual glands are the smallest salivary glands.
Q. 12: Amount of saliva secreted daily ?
A) About 1000 mL per day
B) About 1500 mL per day
C) About 100 mL per day
D) About 500 mL per day
EXPLANATION: Amount of about 1500 mL saliva secreted daily.
Q. 13: What is the amount of saliva of total saliva secreted by parotid glands ?
A) 5 - 10 %
B) 20 - 25 %
C) 70 %
D) 3 - 5 %
EXPLANATION: 20 - 25 % amount of saliva of total saliva secreted by parotid glands. It's secretion is only serous.
Q. 14: About 70% amount of saliva of total saliva secreted by ?
A) Parotid glands
B) Submandibular glands
C) Sublingual glands
D) All of these
EXPLANATION: About 70% amount of saliva of total saliva secreted by submandibular glands. It's secretion contains serous, mucus and amylase.
Q. 15: What is the amount of saliva of total saliva secreted by sublingual glands ?
A) 5 - 10 %
B) 20 - 25 %
C) 70 %
D) 3 - 5 %
EXPLANATION: 3 - 5 % amount of saliva of total saliva secreted by sublingual glands. It's secretion contains serous, mucus and Lipase.
Q. 16: Which of the following nerve mainly innervated to salivary glands ?
A) Facial nerve's sympathetic branches
B) CN Ⅶ's parasympathetic branches
C) Trigeminal Nerve
D) All of these
EXPLANATION: CN Ⅶ (Facial nerve)'s parasympathetic branches mainly innervated to salivary glands.
Q. 17: Which of the following options correct about saliva ?
A) 99% Water and pH 6.2 - 7.4
B) Mucus, enzymes (amylase, lipase) found
C) Electrolytes and antimicrobials found
D) All of these
EXPLANATION: Saliva has 99% Water and pH 6.2 - 7.4, Mucus, enzymes (amylase, lipase), Electrolytes (Na+, K+, Ca2+, Mg2+, Cl-, HCO3- I-) and antimicrobials (Lysozyme, IgA, Lactoperoxidase).
Q. 18: Which of the following options is incorrect about pancreas's endocrine parts. ?
A) α - cells = Glucagon
B) β - cells = Insulin
C) γ - cells = Somatostatin
D) δ - cells = Somatostatin
EXPLANATION: γ - cells absent in pancreas.
Q. 19: Which of the following function is saliva ?
A) Help in Lubricant and digestion
B) Helping role in taste
C) Maintain the mouth pH
D) All of these
EXPLANATION: All of these functions are saliva.
Q. 20: Wherein taste buds located ?
A) Inside tongue's papillae
B) Mucusa
C) On Palate
D) All of these
EXPLANATION: The taste buds located inside tongue's papillae.
Q. 21: How many types of tongue's papillae ?
A) 4
B) 5
C) 6
D) 7
EXPLANATION: Four types of tongue's papillae present in human: Fungiform papillae, Foliate papillae, Filiform papillae and Circumavallate papill.
Q. 22: Which of the following papillae has no any taste buds ?
A) Fungiform papillae
B) Foliate papillae
C) Filiform papillae
D) Circumavallate papill
EXPLANATION: Filiform papillae no contains any taste buds.
Q. 23: How many taste detect by tongue's taste buds ?
A) 3
B) 4
C) 5
D) 6
EXPLANATION: Five taste detect by tongue's taste buds: Sweet, Salty, Bitter, Sour, Umami.
Q. 24: How many of tongue's muscle ?
A) 6
B) 7
C) 8
D) 9
EXPLANATION: Tongue's has 8 muscle: 4 intransic and 4 extrinsic muscles.
Q. 25: Which of the following tongue's muscle is not intrinsic ?
A) Superior-inferior longitudinal muscle
B) Vertical muscles
C) Transvers muscle
D) Hyoglossus
EXPLANATION: Hyoglossus is tongue's extrinsic muscles.
Q. 26: Which of the following tongue's muscle is not Extrinsic ?
A) Genioglossus muscle
B) Styloglossus muscle
C) Transvers muscles
D) Hyoglossus and Palatoglossus muscles
EXPLANATION: Transvers muscles is tongue's intrinsic muscle.
Q. 27: Which of the following tongue's muscle is not innervated by Hypoglossal nerve ?
A) Superior-inferior longitudinal muscle
B) Vertical muscles
C) Transvers muscle
D) Palatoglossus muscles
EXPLANATION: Palatoglossus muscles is innervated by vague nerve (CN Ⅹ).
Q. 28: Which of the following tongue's muscle is innervated by Hypoglossal nerve ?
A) Genioglossus muscle
B) Styloglossus muscle
C) Palatoglossus and Hyoglossus muscles
D) All of these
EXPLANATION: All of these extrinsic muscle are innervated by Hypoglossal nerve (CN Ⅻ).
Q. 29: Which of the following options is correct about tongue's muscles ?
A) Intrinsic: Origin-insertion in tongue
B) Extrinsic: Origin from bone
C) Extrinsic: Inserted in Tongue
D) All of these
EXPLANATION: All of these options is correct.
Q. 30: Which of the following breaks down proteins into small polypeptides in the stomach ?
A) Amylase
B) Pepsin
C) Carboxypeptidase
D) Trypsin
EXPLANATION: Pepsin breaks down proteins into small polypeptides in the stomach.
Q. 31: Which of the following breaks down polysaccharides into disaccharides in the mouth ?
A) Lipase
B) Amylase/Ptyalin
C) Disaccharidease
D) Pepsin
EXPLANATION: Amylase/Ptyalin breaks down polysaccharides into bird disaccharides (Maltose and Dextrose) in the mouth.
Q. 32: Which of the following breaks down small polypeptides into amino acids in the lumen of small intestine ?
A) Trypsin
B) Pepsin
C) Carboxypeptidase
D) Chymotrypsin
EXPLANATION: Carboxypeptidase breaks down small polypeptides into amino acids in the lumen of small intestine.
Q. 33: Which of the following is not a correct type of digestion that occurs in the lumen of the small intestine ?
A) Polysaccharides = Disaccharides
B) Polysaccharides = Monosaccharides
C) Nucleic acid (DNA, RNA) = Nucleotides
D) Polypeptides = Amino acids
EXPLANATION: Polysaccharides break down into disaccharides in lumen of small intestine and then disaccharids break down into monosaccharids in brush border of small intestine.
Q. 34: Which of the following breaks down nucleotides into nucleosides ?
A) Pancreatic nuclease
B) Nucleotidase
C) Nucleosidase
D) All of these
EXPLANATION: Nucleotidase breaks down nucleotides into nucleosides in small intestine.
Q. 35: Which of the following breaks down nucleosides into nitrogenous base, sugar and phosphate ?
A) Pancreatic nuclease
B) Nucleotidase
C) Nucleosidase
D) All of these
EXPLANATION: Nucleosidase breaks down nucleosides into nitrogenous base, sugar and phosphate.
Q. 36: Which of the following artery supply blood to pancreas ?
A) Left gastric artery
B) Common hepatic artery
C) Splenic artery
D) All of these
EXPLANATION: The splenic artery supply blood to pancreas.
Q. 37: Which of the following artery supply blood to stomach ?
A) Left gastric artery
B) Common hepatic artery
C) Splenic artery
D) All of these
EXPLANATION: The Left gastric artery supply blood to stomach.
Q. 38: Which of the following artery supply blood to the liver and gallbladder ?
A) Left gastric artery
B) Common hepatic artery
C) Splenic artery
D) All of these
EXPLANATION: Common hepatic artery supply blood to the liver and gallbladder.
Q. 39: Which of the following organ supplied blood from superior mesenteric artery ?
A) Distal 2/3 duodenum, jejunum, ileum
B) Appendix and Cecum
C) Ascending and Transverse colon
D) All of these
EXPLANATION: All of these organs supplied blood from superior mesenteric artery.
Q. 40: Which of the following organ supplied blood from inferior mesenteric artery ?
A) 1/3 Transvers colon
B) Descending and sigmoid colon
C) Rectum and anus
D) All of these
EXPLANATION: All of these organs supplied blood from inferior mesenteric artery.
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