32. The size of the pupil is controlled by the A.Retina B.Iris C.Cornea D.Lens
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.
