Water absorption mainly occur in :-
- A. Buccal cavity
- B. Intestine
- C. Stomach
- D. Appendix
Correct Answer: B
Rationale: The intestine, especially the large intestine, is the primary site for water absorption.
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The hormone involved in the discharge of pancreatic juice in mammal is called-
- A. Gastrin
- B. Secretin
- C. Secretin & CCK
- D. Enterogasterone
Correct Answer: C
Rationale: Both secretin and CCK stimulate pancreatic juice secretion.
Into which tubes do the nephrons drain?
- A. Proximal convoluted tubule
- B. Collecting duct
- C. Distal convoluted
- D. Ureter
Correct Answer: B
Rationale: Nephrons drain into collecting ducts, which lead to the ureter.
What structure in the intestine increases surface area?
- A. Villas
- B. Villi
- C. Cilia
- D. Protrusii
Correct Answer: B
Rationale: Villi are finger-like projections in the small intestine that increase surface area for absorption.
Starch is digested to maltose by the enzyme amylase. According to the 'lock and key' hypothesis, which is the 'key' and which is the 'lock'?
- A. key: amylase, lock: starch
- B. key: starch, lock: amylase
- C. key: maltose, lock: amylase
- D. key: amylase, lock: maltose
Correct Answer: A
Rationale: In the lock and key model, the enzyme (amylase) is the key that specifically binds to the substrate (starch), acting as the lock.
Largest gland of body -
- A. Pancreas
- B. Duodenum
- C. Liver
- D. Thyroid
Correct Answer: C
Rationale: The liver is the largest gland in the human body, performing numerous metabolic functions.
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