BIOL 2020U Lecture Notes - Inhibitory Postsynaptic Potential, Excitatory Synapse, Opsin
Document Summary
Role of rod cells and cone cells in effecting. Retina contains 4 layers synapse between them: cone and rod cells (light-sensitive receptor) Inner segment nucleus, mitochondria, ribosomes, synaptic region. Outer segment membranous disks containing pigments: bipolar neurones (relay neurone, ganglion cells (sensory neurones, axon of ganglion cells optical nerve. Light passes through neurones before it strikes the retina. There are no cone and rod cells where the optic nerves pass through the retina; this point is called the blind spot. Table 16-8-2: features of rod cells and cone cells. Only type of light receptor at the periphery of the retina. Several rod cells synapse with same relay cell. Each cone cell synapses with just one relay cell. Table 16-8-3: absorption of light by rhodopsin creates a generator potential in rod cells (ap = action potential) Neurotransmitter released into inhibitory synapse [rod bipolar cell] Bipolar neurone hyperpolarised no impulse bipolar neurone depolarised ap.
