Answer
Sensations that may be produced by activation of different types of free nerve endings are thermal sensations (warmth and cold), tickle, and itch.
Work Step by Step
Warmth and cod are mediated by different nerve endings. Temperatures of 10-40 degree C activate cold receptors; temperatures of 32-48 degrees C activate warmth receptors Temperatures below 10 deg.C and above 48 deg. C activate pain receptors. Cold receptors are to be found mainly in the stratum basale of the epidermis; warm receptors are located in the dermis.
The itch sensation is produced by the chemical action of a kinins -- mainly bradykinin--usually as a response to local inflammation.
Tickle is a puzzling sensation; someone can generate the tickle sensation in you, but you can't tickle yourself.
