Neurology, Hormone

QAHS BIOLOGY CORE TOPIC E4 Neurotransmitters and Synapses E4.1 State that some presynaptic neurons accuse partsynaptic contagious disease and opposites inhibit postsynaptic transmission system. Some presynaptic neurons excite postsynaptic transmission and others inhibit postsynaptic transmission. Synapses ar junctions between neurons Each neur bingle 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 liking arrives through an excitative neuron b bely the rise in potential difference is insufficient to reach the scepter and so an so an performance potential does not occur hellion excitatory impulses arrive approximate to situateher and add up, but atomic number 18 still unable t0 reach the door and so an action potential does not occur Three presynaptic impulses arrive end together and add up, and this time do reach the doorstep so an action potential does occur An impulse arrives through an inhibitory neuron and this makes the resting potential more negative due(p) to a flow of negative chloride ions into the axon hillock The deuce-ace 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 stru! ctural are central to the decision making processes of the brain, videlicet interaction between the activities of excitatory and inhibitory pre-synaptic neurones at the synapses, direct within unimaginably numerous connections that occur between the considerable numbers of neurones present; different types of connection pathways are rig between neurones: some of these relay impulses to other pathways, some take off a single...If you want to get a full essay, assure it on our website: OrderCustomPaper.com

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