'The dilator muscle enlarges this part of the eye while the sphincter muscle makes it smaller'
the pupil
THE BODY HUMAN: The dilator muscle enlarges this part of the eye while the sphincter muscle makes it smaller
The dilator muscle enlarges this part of the eye while the sphincter muscle makes it smaller
The dilator muscle enlarges this part of the eye while the sphincter muscle makes it smaller
THE BODY HUMAN
the pupil
THE BODY HUMAN