Human Anatomy, Physiology, and Medicine. Anything human!
in that case, were goin back to the defenition
"In physiology, a stimulus is a detectable change in the internal or external environment." -wikipedia
when your eyes arent used to the light then suddenly exposed to large amount of it, it illicits reflex such as covering it or turning away from it
"When a stimulus is applied to a sensory receptor, it elicits or influences a reflex via stimulus transduction. A stimulus is often the first component of a homeostatic control system. When a sensory nerve and a motor nerve communicate with each other, it is called a nerve stimulus. A stimulus can also be a reaction to a change in your environment. Any of your five senses will accommodate to a particular stimulus." -wikipedia
the very reason why we have this is that to maintain internal balance
or what else is the reason why its there?
it sometimes(actually) does thats why I hate ironing when i was young
there is the reflex (its not even delayed) but due to the fact that the iron is very hot a split second of exposure can hurt
but the response of the body will prevent a further damage and that is exactly what you were saying
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