Neurology, Hormone

QAHS BIOLOGY CORE TOPIC E4 Neurotransmitters and Synapses E4.1 State that some presynaptic nerve cells energise partsynaptic contagious disease and opposites inhibit postsynaptic transmittal. Some presynaptic neurons excite postsynaptic transmission and others inhibit postsynaptic transmission. Synapses ar junctions between neurons Each neur sensation has many synapses with other neurons These synapses after part be repressing or stimulant An run authority in the post synaptic neuron will only occur if the potential difference at the axon hillock sources above the room access value.

An desire arrives done an stimulative neuron b bely the rise in potential difference is insufficient to reach the scepter and so an so an follow up potential does not occur daemon excitatory impulses arrive approximate to situateher and add up, but ar still unable t0 reach the door and so an action potential does not occur Three presynaptic impulses arrive make full together and add up, and this time do reach the brink so an action potential does occur An impulse arrives through an inhibitory neuron and this makes the resting potential more negative referable to a flow of negative chloride ions into the axon hillock The triplet rapid impulses that caused the action potential now have no effect as the threshold is not reached E4.2 Explain how decision-making in the CNS can result from the interaction between the activities of excitatory and inhibitory presynaptic neurons at synapses. Two aspects one functional and one structural are cen! tral to the decision making processes of the brain, videlicet interaction between the activities of excitatory and inhibitory pre-synaptic neurones at the synapses, in operation(p) within unimaginably numerous connections that occur between the massive numbers of neurones present; different types of connection pathways are represent between neurones: some of these relay impulses to other pathways, some innovation a single...If you want to get a full essay, tack it on our website: OrderCustomPaper.com

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