The part of the eye that uses muscle tissue for opening and closing movements is the iris. The iris contains two sets of smooth muscles (the sphincter pupillae and the dilator pupillae) that control the size of the pupil, allowing it to open and close to regulate the amount of light that enters the eye.
The human body has 4 types of tissues. What part of the eye uses muscle tissue for opening and closing movements?
Iris
Retina
Cornea
Sclera
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