Hey, I was wondering. Could one of the causes of pupil dilation be adrenalin?
Yes, adrenalin will cause pupils to dilate. For the same emotions you mentioned, adrenalin is secreted, and it makes your body more alert. Pupil dilation occurs in order to allow more light to enter your eye so that even in the dark you can better see things and choose how to react-one of the reasons adrenalin is regarded as the ‘fight or flight’ hormone.