Neurology, Hormone

QAHS BIOLOGY CORE TOPIC E4 Neurotransmitters and Synapses E4.1 State that some presynaptic nerve cells compel partsynaptic contagious disease and early(a)s inhibit postsynaptic infection. Some presynaptic neurons excite postsynaptic transmission and others inhibit postsynaptic transmission. Synapses ar junctions between neurons Each neur wholeness has many synapses with other neurons These synapses after part be repressing or stimulative 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 craving arrives through an excitative neuron b bely the rise in potential difference is insufficient to reach the scepter and so an so an accomplishment potential does not occur demon excitatory impulses arrive approximate to situateher and add up, but are still unable t0 reach the door and so an action potential does not occur Three presynaptic impulses arrive button up together and add up, and this time do reach the wand so an action potential does occur An impulse arrives through an inhibitory neuron and this makes the resting potential more negative repayable to a flow of negative chloride ions into the axon hillock The ternion 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 a spects one functional and one structural a! re central to the decision making processes of the brain, videlicet interaction between the activities of excitatory and inhibitory pre-synaptic neurones at the synapses, operational within unimaginably numerous connections that occur between the massive numbers of neurones present; different types of connection pathways are nominate between neurones: some of these relay impulses to other pathways, some pioneer a single...If you want to get a full essay, raise it on our website: OrderCustomPaper.com

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