Neurology, Hormone

QAHS BIOLOGY CORE TOPIC E4 Neurotransmitters and Synapses E4.1 State that some presynaptic nerve cells come alive 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 integrity has many synapses with other neurons These synapses after part be repressing or excitant 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 appetite arrives through an stimulative neuron b bely the rise in potential difference is insufficient to reach the scepter and so an so an activeness potential does not occur daemon 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 snug together and add up, and this time do reach the limen so an action potential does occur An impulse arrives through an inhibitory neuron and this makes the resting potential more negative cod to a flow of negative chloride ions into the axon hillock The troika 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. Tw o aspects one functional and one structural! 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 gigantic numbers of neurones present; different types of connection pathways are prepare between neurones: some of these relay impulses to other pathways, some founding a single...If you want to get a full essay, pose it on our website: OrderCustomPaper.com

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