Nokea
The following enzymes and inhibitors are matched correctly:
- A. Xanthine oxidase-allopurinol
- B. Enolase-fluoride
- C. Cholinesterase-physostigmine
- D. Ceruloplasmin-penicillamine
Correct Answer: A
Rationale: Xanthine oxidase-allopurinol: Allopurinol inhibits xanthine oxidase, which plays a role in purine metabolism, and is used to treat gout and prevent uric acid buildup.
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Regarding cough receptors:
- A. There is increased sensitivity in viral infections
- B. ~2-agonists decrease the sensitivity of cough receptors
- C. Exercise can stimulate the cough receptors in asthmatics
- D. They are predominantly seen in the large airways
Correct Answer: A
Rationale: Cough receptor sensitivity increases during viral infections, leading to heightened cough reflex.
Injury to radial nerve involves:
- A. Abductor pollicis brevis is affected
- B. Abduction at the shoulder joint is impaired
- C. Sensory loss on the medial aspect of forearm is seen
- D. First dorsal interosseus is affected
Correct Answer: B
Rationale: Abduction at the shoulder joint is impaired
The reason that the hematocrit is so high is
- A. chronic hypoxia
- B. it was taken in a low cardiac output state
- C. it was a peripheral finger stick
- D. embolic stroke
Correct Answer: A
Rationale: Chronic hypoxia leads to secondary polycythemia as a compensatory mechanism.
In normal neonates:
- A. Extracellular fluid volume exceeds intracellular fluid volume
- B. In a term baby, plasma calcium levels exceed that of the mother
- C. Clamping the umbilical cord after cessation of cord pulsations increases the blood volume by 20% in the baby
- D. There are two arteries and one vein in the umbilical cord
Correct Answer: A
Rationale: In neonates, extracellular fluid volume is greater than intracellular fluid volume, reflecting the transition from intrauterine to extrauterine life.
Examples of encapsulated organisms are all except:
- A. Pseudomonas
- B. Proteus
- C. Pneumococci
- D. Salmonella
Correct Answer: A
Rationale: The correct answer is A because Pseudomonas is not an encapsulated organism. The other options (b-e) are encapsulated.