Some touch receptors sense differences in temperature or pain, and merkel's discs are touch receptors. Given these facts, what sense differences in temperature or pain among the following options:
- Veins and arteries.
 - the skin
 - Merkel's discs
 - movie discs
 - frontal zones
 - cd discs
 - sensory neurons
 - sound discs


 

   Merkel's discs      