MCQ 131:
What is the main function of the appendix?
A) Digestion of proteins
B) Absorption of nutrients
C) Storage of bile
D) Immune function and gut flora maintenance
Answer: D) Immune function and gut flora maintenance
Explanation: The appendix is believed to play a role in immune function and serves as a reservoir for beneficial gut bacteria.
MCQ 132:
Which of the following enzymes is responsible for the digestion of fats?
A) Amylase
B) Pepsin
C) Lipase
D) Sucrase
Answer: C) Lipase
Explanation: Lipase is the enzyme that breaks down fats into fatty acids and glycerol during digestion.
MCQ 133:
Which nutrient is absorbed directly into the bloodstream without being digested?
A) Amino acids
B) Glucose
C) Vitamins
D) All of the above
Answer: D) All of the above
Explanation: Amino acids, glucose, and certain vitamins can be absorbed directly into the bloodstream without further digestion.
MCQ 134:
What is the primary role of the small intestine?
A) Storage of bile
B) Digestion of proteins
C) Absorption of nutrients
D) Production of digestive enzymes
Answer: C) Absorption of nutrients
Explanation: The small intestine’s primary role is to absorb nutrients from digested food into the bloodstream.
MCQ 135:
What is the primary function of gastric lipase?
A) Digestion of carbohydrates
B) Digestion of proteins
C) Digestion of fats
D) Emulsification of fats
Answer: C) Digestion of fats
Explanation: Gastric lipase is an enzyme that helps break down fats in the stomach, although most fat digestion occurs in the small intestine.
MCQ 136:
What is the main site for the absorption of water in the digestive system?
A) Stomach
B) Small intestine
C) Large intestine
D) Duodenum
Answer: C) Large intestine
Explanation: The large intestine is primarily responsible for absorbing water and electrolytes from indigestible food matter.
MCQ 137:
Which nutrient is primarily absorbed in the duodenum?
A) Proteins
B) Carbohydrates
C) Fats
D) All of the above
Answer: D) All of the above
Explanation: The duodenum is where the digestion of proteins, carbohydrates, and fats begins, and nutrients start to be absorbed.
MCQ 138:
Which hormone stimulates the secretion of gastric acid in the stomach?
A) Cholecystokinin
B) Secretin
C) Gastrin
D) Insulin
Answer: C) Gastrin
Explanation: Gastrin is released in response to food in the stomach and stimulates the secretion of gastric acid.
MCQ 139:
What type of digestion occurs in the small intestine through the action of bile?
A) Mechanical digestion
B) Chemical digestion
C) Emulsification
D) Absorption
Answer: C) Emulsification
Explanation: Bile emulsifies fats, increasing their surface area for digestive enzymes to act upon.
MCQ 140:
Which of the following is a characteristic of lipids?
A) Soluble in water
B) Contains nitrogen
C) Stores energy
D) Forms amino acids
Answer: C) Stores energy
Explanation: Lipids, including fats and oils, are important for energy storage and are insoluble in water.
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