Receptors – the Pacinian corpuscle & the eye

  • outline the roles of sensory receptor cells in detecting stimuli and stimulating the transmission of nerve impulses in sensory neurones (a suitable example is the chemoreceptor cell found in human taste buds)
  • describe the basic structure of a Pacinian corpuscle
  • explain how the deformation of stretch-mediated sodium ion channels in a Pacinian corpuscle leads to the establishment of a generator potential
  • describe the human retina in sufficient detail to show how differences in sensitivity to light, sensitivity to colour and visual acuity are explained by differences in the optical pigments of rods and cones and the connections rods and cones make in the optic nerve