BIOLOGY 2A03 Chapter Notes - Chapter 10-11: Autonomic Nervous System, Lamellar Corpuscle, Sensory Neuron
11 Feb 2016
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Classified based on the mode of stimulus they detect (light, chemicals, temperature, mechanical) Sensory receptors can be specialized endings of afferent neurons, or a separate cell that synapses with an afferent neuron. Receptor potential: graded potential induced by a. Sensory receptors tend to adapt over time stimulus in a sensory receptor: slow & fast adapting. Information about stimulus intensity is transmitted based on action potential frequency. Stimulus intensity is also coded into receptor potentials: adapting still decrease over time, but a stronger stimulus leads to a larger graded potential. Sensory pathways generally follow the model at left, where the afferent neuron transmits sensory information to the cns. A single afferent neuron can diverge to several second-order. Second-order interneurons can receive and integrate signals from many afferent neurons (convergence. Many (but not all) interneurons transmit information to the thalamus, a major relay centre for sensory input.
