thermoreceptor
somatic receptors and special receptors
chemoreceptors
Chemoreceptors.
Silent receptors are a proportion of total receptors that are to be occupied before there is any response. It is an model and these are not a distinct subgroup of receptors.
Chemoreceptors (chemical receptors) respond to chemicals in food and scents.
As chemical reacions
You can consider it as general.
A stretch receptors is classified as a mechanoreceptor.
These are sensory receptors. They are classified according to their function. The one for touch is Mechanoreceptor and other for teperature is thermoreceptor.
Everywhere. Literally. The universe is filled with infrared radiation and will be until the universe's temperature drops to absolute zero. As for where it is found in abundance : any place that feels warm to you.
Chemoreceptors are classified as sensory cells or organs that respond to chemical stimuli. The nose and tongue are both equipped with chemoreceptors.
The criteria used to classify sensory receptors depends on the type of nerve signals associated with the sensory receptors. Olfactory receptors read chemical signals and associate them with a corresponding smell, tastebuds read chemical signals and associate them with a corresponding taste ect..