NEET 2025 MCQ with Answer Explanation : “Digestion and Absorption”.

MCQ 41:
What is the function of secretin in digestion?

A) Stimulates bile release
B) Inhibits gastric motility
C) Stimulates pancreatic juice secretion
D) Increases gastric acid production

Answer: C) Stimulates pancreatic juice secretion

Explanation: Secretin stimulates the pancreas to secrete bicarbonate-rich pancreatic juice to neutralize stomach acid in the small intestine.

MCQ 42:
Which organ plays a key role in detoxifying substances absorbed from the digestive tract?

A) Pancreas
B) Liver
C) Spleen
D) Kidney

Answer: B) Liver

Explanation: The liver detoxifies harmful substances absorbed from the digestive tract before they enter systemic circulation.

MCQ 43:
Which of the following nutrients is absorbed through the lymphatic system?

A) Glucose
B) Amino acids
C) Fatty acids
D) Vitamins

Answer: C) Fatty acids

Explanation: Fatty acids and monoglycerides are absorbed into the lymphatic system before entering the bloodstream, primarily through lacteals.

MCQ 44:
What role do pancreatic enzymes play in digestion?

A) Digestion of carbohydrates only
B) Digestion of proteins and fats only
C) Digestion of carbohydrates, proteins, and fats
D) None of the above

Answer: C) Digestion of carbohydrates, proteins, and fats

Explanation: Pancreatic enzymes, including amylase, proteases, and lipase, are responsible for the digestion of carbohydrates, proteins, and fats.

MCQ 45:
Which of the following is a primary function of the gallbladder?

A) Producing bile
B) Storing bile
C) Absorbing nutrients
D) Secreting digestive enzymes

Answer: B) Storing bile

Explanation: The gallbladder stores bile produced by the liver until it is needed for digestion in the small intestine.

MCQ 46:
What is the primary site of protein digestion?

A) Mouth
B) Stomach
C) Duodenum
D) Small intestine

Answer: B) Stomach

Explanation: Protein digestion begins in the stomach with the action of pepsin.

MCQ 47:
Which vitamin is synthesized by gut bacteria?

A) Vitamin A
B) Vitamin C
C) Vitamin K
D) Vitamin E

Answer: C) Vitamin K

Explanation: Gut bacteria synthesize vitamin K, which is important for blood clotting.

MCQ 48:
Which digestive enzyme is responsible for breaking down starches into sugars?

A) Lactase
B) Amylase
C) Sucrase
D) Maltase

Answer: B) Amylase

Explanation: Amylase is the enzyme that breaks down starches into simpler sugars.

MCQ 49:
What is the primary role of the pancreas in digestion?

A) Producing bile
B) Secreting digestive enzymes
C) Absorbing nutrients
D) Breaking down carbohydrates

Answer: B) Secreting digestive enzymes

Explanation: The pancreas secretes enzymes that digest carbohydrates, proteins, and fats in the small intestine.

MCQ 50:
Which part of the digestive system absorbs the majority of water?

A) Stomach
B) Small intestine
C) Large intestine
D) Esophagus

Answer: C) Large intestine

Explanation: The large intestine is primarily responsible for water absorption, concentrating waste for excretion.