Assertion: uvea's muscle | /r/CapableOf | control the size of the pupil
Facets:
Source sentences:
text: Two involuntary muscles control the size of the pupil, sphincter pupillae innervated by parasympathetic fibres narrows the pupil and the sympathetically stimulated dilator pupillae muscle opens it.
text: These muscles control the size of the pupil and thus determine how much light reaches the sensory tissue of the retina.