Sensory Pathways

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1. Which of the following do mechanoreceptors and chemorecptors have in common?

  • When unstimulated, the ion channel is closed
  • The ion channel is also the receptor
  • The stimulus acts directly on the ion channel
  • The stimulus is the binding of a molecule
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2. In the homunculus, the body areas are represented with regards to what?

  • Tactile Sensitivity
  • Skin Area

3. What mechanism do the centre/surround receptor fields exhibit? (These receptor fields are present in the dorsal column nuclei and thalamic neurones

  • Lateral Excitation
  • Lateral Inhibition
  • Medial Inhibtion
  • Medial Excitation

4. What effect does an increase in intensity have on action potentials?

  • It increases the frequency of the action potentials
  • It has no effect
  • It increases duration of the action potentials
  • It increases the intensity of the action potential itself

5. Which of the following sub-modalities is not processed by the somatosensory system?

  • Head motion
  • Temperature
  • Touch
  • Nociception

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