what is stimuli? give an example
It is a thing or event that evokes a specific functional reaction in an organ or tissue.
In humans, sensitivity is due to portions of the nervous system called receptors. Receptors are typically neurons or cells that are able to sense changes in the environment. For example:
Photoreceptors in the eyes detect changes in light
Thermoreceptors detect changes in heat
Baroreceptors detect changes in pressure
these all are stimulis.