1. Sensory physiology Smell (olfaction) – the cells
Taste (gustation) – the cells, transduction and current through channels
Vision – neural cells of the retina
transduction

3. 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

11. Dark current Membrane is depolarized at rest
 Neurotransmitter is released

12. Photon strikes rhodopsin
Membrane potential hyperpolarizes
 less neurotransmitter is released

14. Convergence in the retina
Also, lateral inhibition