A sensory receptor responds to stimulus in the internal or external environment. Sensory receptors generates nerve impulses and transmits it to the brain for interpretation and perception by receiving information or stimulus from an environment and conducts a process of generating nerve impulses to be transmitted to the brain for interpretation and perception.
Sensory receptors activates by any of the types of stimuli given below:
Chemoreceptors detects changes in the chemical composition of the environment.
Electromagnetic receptors respond to electricity and magnetism.
Photoreceptors detects light.
Thermoreceptors are specialized nerve cells that are able to detect differences in temperature.
Nociceptors activates by noxious stimuli and responds to defensive reactions.
Example Of Nociceptors:
Grasshopper mice feel no pain when stung by venomous bark while attempting to capture the scorpion, the mouse usually gets stung multiple times by the scorpion but does not seem to be affected as nociceptors receptors responds to it and activate defensive reactions by increasing sensitivity to noxious stimuli which means to tissue damaging event.