Question

The iris in the human eye contracts and expands, controlling the amount of light that reaches the retina. What types of muscle control this?

Answer 1

smooth muscles.

Step-by-step explanation:

these involve the action of dilation and contraction, dilation increases the size of the pupil and allows for more light to make it to the retina, while contraction is opposite.

Answer 2

Smooth and Involuntary

Step-by-step explanation:

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