Neuroscience 1. Many sensory and synaptic ion channels are non-selective cation channels that pass Na+ and K+...

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Medical Sciences

Neuroscience
1. Many sensory and synaptic ion channels are non-selectivecation channels that pass Na+ and K+ equally well. Explain whythese sensory ion channels are excitatory in neurons. Base youranswer on what you know about typical ion equilibrium potentials,control of resting membrane potential in neurons and control ofaction potential threshold in neurons.

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The binding of the chemical neurotransmitters on the receptorspresent on the dendrites causes opening of the ion channels to flowions in and out of the neuron resulting the chemical signalconverted into an electrical signalThus the inner restingpotential which is negative70 mV becomes less negative and theaction potential is generated throughout the axonsThere are moreNaCl and Ca2 outside the cell and more K and negativelycharged proteins inside the cellThis gives an overall negativepotential inside the cellWhen a neurotransmitter binds to thereceptors present on the dendrites the ligand gated ion channelsopens to flow the ions inEgThe ligand gated Na channels open toflow Na ions into the cellThe extra positive charge See Answer

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