The peripheral nervous system

Answer 1

• Mechanoreceptors—respond to touch, pressure, vibration, and stretch
• Thermoreceptors—sensitive to changes in temperature
• Photoreceptors—respond to light energy (example: retina)
• Chemoreceptors—respond to chemicals (examples: smell, taste, changes in blood
  chemistry)
• Nociceptors—sensitive to pain-causing stimuli (examples: extreme heat or cold, excessive
  pressure, inflammatory chemicals)