2025 - Multiple Choice Questions
What is the mechanism of action of ondansetron?
- Dopamine D₂ receptor antagonism in the chemoreceptor trigger zone
- Selective 5-HT₃ receptor antagonism in the gastrointestinal tract and central nervous system
- Histamine H₁ receptor antagonism in the vestibular system
- Neurokinin-1 (NK₁) receptor antagonism in the area postrema
Which drug is associated with a Phase II block?
- Rocuronium
- Vecuronium
- Suxamethonium
- Cisatracurium
What is the mechanism of action of salbutamol on the peripheral vasculature?
- Vasodilation via B1 agonism
- Vasoconstriction via B1 agonism
- Vasodilation via B2 agonism
- Vasoconstriction via B2 agonism
According to Poiseuille's Law, which of the following is inversely proportional to flow?
- Viscosity
- Density
- The fourth power of the radius
- Velocity
How much heat is lost by radiation by the body at rest?
- 80-90%
- 60-70%
- 30-40%
- 10-20%