Nokea
Kupffer cells, one of the following is not true:
- A. May contain Hemosiderin granules
- B. Motile within liver blood sinusoids
- C. Phagocytic cells present mainly in space of Disse
- D. Form part of the liver sinusoidal wall
Correct Answer: C
Rationale: Kupffer cells are phagocytic and part of the sinusoidal wall, but they are in the lumen, not the space of Disse.
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Where are the osmoreceptors located?
- A. Kidney
- B. Hypothalamus
- C. Pituitary
- D. Liver
Correct Answer: B
Rationale: Osmoreceptors in the hypothalamus detect blood osmolarity changes.
What role does the stomach play in the maintenance of normal vitamin B12 levels?
- A. Produces intrinsic factor
- B. Absorbs vitamin B12
- C. Stores vitamin B12
- D. Converts vitamin B12
Correct Answer: A
Rationale: The stomach's parietal cells produce intrinsic factor, necessary for vitamin B12 absorption in the ileum.
What is the name of the tube that carries food from the mouth to the stomach?
- A. Trachea
- B. Oesophagus
- C. Duodenum
- D. Food tube
Correct Answer: B
Rationale: The esophagus is the muscular tube that transports food from the mouth to the stomach. The trachea is for air, the duodenum is part of the small intestine, and 'food tube' is not a scientific term.
What role does the stomach play in the maintenance of normal vitamin B12 levels?
- A. Produces intrinsic factor
- B. Absorbs vitamin B12
- C. Stores vitamin B12
- D. Converts vitamin B12
Correct Answer: A
Rationale: The stomach's parietal cells produce intrinsic factor, necessary for vitamin B12 absorption in the ileum.
The term used to describe the stomach's expansion to accommodate volume without any rise in intraluminal pressure is referred to as:
- A. Vomiting
- B. Activation of osmoreceptors
- C. Folding inward (invagination)
- D. Relaxation in response to stimulation (receptive relaxation)
Correct Answer: D
Rationale: Receptive relaxation allows the stomach to expand as food enters, mediated by the vagus nerve, without increasing pressure.