Physiology 3120 Lecture Notes - Classical Conditioning, Sound Intensity, Protein Folding
3 Mar 2014
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1011 neurons 1015 synaptic connections: cns = brain & spinal cord, pns = nerve, types of brain cells, neurons. Major function: contribute to the well-being of neurons: remove neurotransmitters, removing ammonia (by-product of metabolism, supply glucose to neurons, taking up excess extracellular k, provide myelin sheaths for axons. Neuron: chemical synapse, most common, high electrical resistance between pre- & post-synaptic cells. 85 mv: only na+ & k+ - somewhere between the two (experiments show value is 0 mv) Epsp & ipsp: epsp, transient (15 ms doesn"t have enough time to reach 0 mv) increase in conductance to both. Na+ & k+ but na+ dominates & cell depolarizes. Long change: takes membrane potential towards zero/threshold. If it was longer it would reach 0. Ipsp equilibrium potential (far from ap threshold: produced by different transmitters. Potential: signal flow through neuron involves receiving chemical signals at synapses by chemical transmission, excitatory synapses, causes na+ to enter bringing in +ve charge.
