KIN 155 Study Guide - Midterm Guide: Type Ia Sensory Fiber, Myelin, Pitching Machine
6 Feb 2015
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Over 100k bil synapses < glial cells (nutrition and repair) motor neuron efferent! Sensory afferent interneuron most others; neuron to neuron. Neurotransmitters effect is determined by protein receptor properties. 2 types ; ionotropic protein ion channels metabotropic trigger a 2nd messenger excitatory neurotransmitters/ receptors leads to depolarization of membrane called excitatory post synaptic potential. Hyperpolarize membranes inhibitory post synaptic potential ipsp increases permeability to cl- Axon hillock and action potential voltage gated ion chnls only open at threshold depol current spreads on dendrite membrane; wants to converge at the axon hillock. Summation of all epsp and ipsp occur at the axon hillock. Action potentials propagate down the axon there are nodes/gaps (with voltage gated ion chnl) for recharge so that the signal doesn"t fade. Gaps are too wide; action potential can"t reach next v gated ion chnl. (if myelin is faded) -blocks voltage gated ion chnls at nodes of ranvier so signals wont be sent.
