Nokea
During active HCL secretion parietal cell shows:
- A. Few short microvilli while tubulovesicular system increases.
- B. Microvilli are prominent numerous while the tubulovesicular system decreases.
- C. More rER & secretory vesicles
- D. Cytoplasm becomes more basophilic
Correct Answer: B
Rationale: During active HCl secretion, parietal cells' intracellular canaliculi expand with numerous microvilli, and the tubulovesicular system decreases as it fuses with the canaliculi.
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Secretin and cholecystokinin are secreted in
- A. Pyloric region
- B. Ileum
- C. Duodenum
- D. Oesophagus
Correct Answer: C
Rationale: Secretin and cholecystokinin are secreted in the duodenum to regulate pancreatic and gallbladder activity.
The kidneys, skin, and lungs are each a part of the system.
- A. integumentary
- B. respiratory
- C. excretory
- D. digestive
Correct Answer: C
Rationale: The kidneys, skin, and lungs are all part of the excretory system, removing various wastes.
The crypts of Lieberkuhn secrete :
- A. Gastrin
- B. Rennin
- C. Cholecystokinin
- D. Succus entericus
Correct Answer: D
Rationale: Crypts of Lieberkuhn secrete succus entericus (intestinal juice) for digestion in the small intestine.
Decreased levels of bile salts in the bile would interfere with digestion of:
- A. Fat
- B. Disaccharides
- C. Complex carbohydrates
- D. Protein
Correct Answer: A
Rationale: Bile salts emulsify fats, breaking them down into smaller droplets to facilitate digestion by lipase enzymes.
What happens during the oral phase of digestion?
- A. Food is chewed and mixed with saliva
- B. Chyme is formed with gastric juice
- C. Nutrients are absorbed
- D. Waste is expelled
Correct Answer: A
Rationale: In the oral phase, food is mechanically broken down by chewing and mixed with saliva to begin starch digestion.