Yes.
"In humans and many animals (but few fish), the size of the pupil is controlled by involuntary constriction and dilation of the iris in order to regulate the intensity of light entering the eye."
http://en.wikipedia.org/wiki/Pupil
please check my answer again thanks
Pupillary constiction in the presence of bright light is an example of what reponse ?
A active tropic
B passive tropic
C unconditioned
D conditioned
I now say it's C
1 answer
2 answers