The pupil is the opening in the iris that allows light into the vertebrate eye; its size is regulated by muscles in the iris.
La pupila es la abertura en el iris que permite la entrada de luz en el ojo del vertebrado; sus músculos regulan su tamaño.
| Front | pupil |
|---|---|
| Back | The opening in the iris, which admits light into the interior of the vertebrate eye. Muscles in the iris regulate its size. |
Tags: ch.50
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