Q1082
The size of the pupil is controlled by the
A.
Retina
B.
Iris
AnswerC.
Cornea
D.
Lens
Answer: Option B
Solution
Answer: Option B
Solution:
The size of the pupil is controlled by the activities of two muscles: the circumferential sphincter muscle found in the margin of the iris, innervated by the parasympathetic nervous system: and the iris dilator muscle, running radially from the iris root to the peripheral border of the sphincter.