q15 - yousmle99

[ArchivalUser]

Pupil size is an important indicator of brainstem function. Which of the following results in pupillary constriction?

(A) atropine, a blocker of muscarinic receptors
(B) decreased parasympathetic activity of inner eye muscle fibers during darkness
© general increased sympathetic tone during emotional excitement
(D) increased sympathetic activity of inner eye muscle fibers during darkness
(E) phentolamine, a blocker of alpha adrenergic receptors

[ArchivalUser]

E

[ArchivalUser]

Alpha 1 agonist cause radial muscle contraction under sympathetic - hence mydriasis
so alpha 1 blockers will cause meiosis, but same with a muscarinic agonist.
TO differentiate, we look at accomodation.

[ArchivalUser]

Yes , you both are correct, Its E again.
Good job .

[ArchivalUser]

THank you crossover. That's good pint indeed.

[ArchivalUser]

Point*

[ArchivalUser]

point*