Sensory physiology

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Sensory physiology

• Smell (olfaction) the cells
• Taste (gustation) the cells, transduction and
  current through channels
• Vision neural cells of the retina
• transduction

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Olfaction

• Humans can smell about 10,000 different odours
• How many receptor proteins for odours are there?
• Odorant receptors are G-protein coupled receptors
• The G protein is called Golf

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Dark current
Membrane is depolarized at rest ?
Neurotransmitter is released
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Photon strikes rhodopsin

• Membrane potential hyperpolarizes
• ? less neurotransmitter is released

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Convergence in the retina Also, lateral inhibition