MCQ 81:
Which of the following nutrients is absorbed through the intestinal walls into the lymphatic system?
A) Amino acids
B) Simple sugars
C) Fatty acids
D) Nucleotides
Answer: C) Fatty acids
Explanation: Fatty acids and monoglycerides are absorbed into the lymphatic system before entering the bloodstream.
MCQ 82:
What is the main function of the pancreas in relation to digestion?
A) Producing bile
B) Secreting digestive enzymes and bicarbonate
C) Absorbing nutrients
D) Storing nutrients
Answer: B) Secreting digestive enzymes and bicarbonate
Explanation: The pancreas produces digestive enzymes and bicarbonate to help neutralize stomach acid in the small intestine.
MCQ 83:
Which vitamin is primarily absorbed in the small intestine?
A) Vitamin B12
B) Vitamin K
C) Vitamin D
D) All of the above
Answer: D) All of the above
Explanation: Vitamins B12, K, D, and others are absorbed in the small intestine, although B12 requires intrinsic factor.
MCQ 84:
What role does fiber play in digestion?
A) Digests nutrients
B) Absorbs water
C) Regulates blood sugar
D) All of the above
Answer: D) All of the above
Explanation: Fiber aids in digestion by promoting bowel regularity, absorbing water, and helping to regulate blood sugar levels.
MCQ 85:
Which digestive enzyme is active in the acidic environment of the stomach?
A) Amylase
B) Trypsin
C) Pepsin
D) Lipase
Answer: C) Pepsin
Explanation: Pepsin is the enzyme that functions optimally in the acidic environment of the stomach to digest proteins.
MCQ 86:
What type of digestion occurs in the mouth?
A) Chemical digestion only
B) Mechanical digestion only
C) Both mechanical and chemical digestion
D) None of the above
Answer: C) Both mechanical and chemical digestion
Explanation: In the mouth, food is mechanically broken down by chewing and chemically digested by enzymes in saliva.
MCQ 87:
Which of the following is a function of the small intestine?
A) Production of bile
B) Absorption of nutrients
C) Storage of feces
D) Activation of pepsin
Answer: B) Absorption of nutrients
Explanation: The small intestine is primarily responsible for the absorption of nutrients from digested food.
MCQ 88:
What is the role of lactase in digestion?
A) Breaks down starches
B) Breaks down proteins
C) Breaks down lactose
D) Breaks down fats
Answer: C) Breaks down lactose
Explanation: Lactase is the enzyme that breaks down lactose, the sugar found in milk, into glucose and galactose.
MCQ 89:
Which part of the digestive system is responsible for the final stage of digestion and absorption?
A) Stomach
B) Duodenum
C) Jejunum
D) Ileum
Answer: D) Ileum
Explanation: The ileum is the final part of the small intestine where the majority of nutrient absorption occurs.
MCQ 90:
What is the main function of the cecum?
A) Digestion of carbohydrates
B) Absorption of water
C) Storage of bile
D) Fermentation of undigested food
Answer: D) Fermentation of undigested food
Explanation: The cecum, part of the large intestine, helps ferment undigested food material.
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