Sensory receptor

• What do sensory receptors do

  Convert stimulus into nerve impulse
• What are effectors usually

  Muscles or glands
• What is it called when receptors convert stimulus into nervous Impulse

  generator impulse
• What is a mechanoreceptor

  Detects pressure and movement for example the pacinian corpuscle
• What is the chemoreceptor

  detects chemicals for example olfactory receptor (in the nose)
• What is a thermoreceptor

  Detects heat for example end bulbs of krause (in the tongue)
• What is the photoreceptor

  Detects light for example cone cells (in the eye)
• What is the pacinian corpuscle

  Specific sensory receptors that detects mechanical pressure found in the skin and most abundant in fingers and soles of the feet
• what are the specific channels in a neurone ending in a pacinican corpuscle called

  Stretch meditated sodium channels
• How does a pacinian corpuscle convert pressure into an impulse

  1. In resting state sodium channels are too narrow to allow sodium through
  2. when pressure applied to the pacinian corpuscle, it changes shape so the membrane around the neurone stretches
  3. this causes the sodium channels to widen, sodium ions enter the neurone
  4. membrane becomes depolarised resulting in a generator potential
  5. generator potential creates an ac potential