discuss the excitatory NMDA receptor, the role of the Mg++ ion, and how NMDA activation can produce Long Term Potentiation (which could underlie memory). Finally, what is the seemingly unique involvement of neighboring glia cells in helping to regulate both GABA and Glutamate neurotransmission and why might that glia cell role occur
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discuss the excitatory NMDA receptor, the role of the Mg++ ion, and how NMDA activation can produce Long Term Potentiation (which could underlie memory). Finally, what is the seemingly unique involvement of neighboring glia cells in helping to regulate both GABA and Glutamate neurotransmission and why might that glia cell role occur
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- Photoreceptor cells form glutamatergic synapses onto bipolar cells and when photoreceptor cells are depolarized the release of glutamate into the synapse is increased. One class of bipolar cells, (called OFF bipolar cells) have excitatory glutamate receptors in their post-synaptic specialization. What happens to the membrane potential of OFF bipolar cells when photoreceptors are illuminated?Changes in intracellular Ca2+ is one of the main governing factors that determines the direction of plasticity (i.e., whether a synapse potentiates or depresses). Provide a general mechanism to explain how changes in intracellular Ca2+ can result in either synaptic depression or synaptic potentiation (refer to our discussion on kinases and phosphatases).What type of synaptic potential (if any; be sure to indicate if any modification is occurring as well) would occur if: a.) An MAO inhibitor type of antidepressant is functioning at an active dopaminergic synapse that increases the rate of sodium flowing into the cell. b.) Prozac is present at an active serotonin synapse where receptor activation increases the flow of potassium out of the cell.
- The correlation between neurons can explain the basis of the synaptic modification, that is, how much they can connect to each other or if they are not synchronized, how much they can lose or weaken their connections. Draw a picture of an excitatory synapse such as glutamatergic with its receptors between the pre- and postsynaptic neuron.Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold. thanks a lot in advance:)Depression is a condition in which sufferers may feel low mood, lack of motivation and sleep. It is caused by a lack of serotonin in the synaptic cleft of neurone pathways. Serotonin is a neurotransmitter. a) Describe how serotonin acts as a neurotransmitter. Using your understanding of synaptic transmission, explain how communication between neurones in serotonin pathways of the brain would be affected in someone with depression. b) Doctors use tubocurarine drug as an anaesthetic as it temporarily paralyses muscles. It blocks receptors at neuromuscular junctions. Why does this lead to paralysis?
- Parkinson's Disease Parkinson's disease is neurodegenerative disorder that affects movement. Most people affected with Parkinson's disease demonstrate rigidity, slow movement, and shaking. The symptoms of Parkinson's disease occur when the cells that produce dopamine neurotransmitters die in the brain. Explain how the signal transmission at a synapse in an individual with Parkinson's disease is different than an unaffected individual. Describe the normal process of signal transmission at a synapse. Start with the arrival of an action potential at the axon terminal and include the name of the neurotransmitter that is affected by Parkinson's disease. Explain how the process is different in individuals affected with Parkinson's disease.apucreceptors ava ble at the synapse are reflected in this number. Question 2: In this chapter, we discussed a GABA-gated ion channel that is permeable to Cl. GABA also activates a G-protein-coupled receptor called the GABA receptor, which causes potassium-selective B channels to open. What effect would GABAB receptor activation have on the membrane potential? GABAB receptor activation causes potassium-selective channels to open. As a result this bringhs theBesides the standard post- and pre-synapse that exchange information, non neuronal cell types also play a role in synaptic transmission. One of those are called astrocytes and can form a tripartite synapse. Explain the roles of astrocytes in synaptic transmission.
- In the discussion section the authors wrote “In this study, we observed that different paradigms of tES application could ameliorate motor function impairments in ICH induced by collagenase administration into the striatum of rats.” a. Is the information in this quote about afferent of efferent? b.By what word or words do you know that your answer to the question is correct? c. Why did you choose this word or words as an answer to the question?Why was the postsynaptic CA1 neuron voltage clamped to +30 mV? To stimulate insertion of AMPA receptors into the postsynaptic membrane To move NDA receptors into the synapse from an extrasynaptic site To cause coordination between the pre- and postsynaptic neuron To increase conductance of the NMDAR by removing the Mg?* block To stimulate AMPA receptors, which in turn activate NMDA Rs Explain the results obtained when AP5 was applied while the neuron was held at +30 mV. What is the interpretation of the result?Match the events listed with their order in the mechanisms behind the firing of an action potential under normal conditions (without tetrodotoxin present in the man's body). The cell has a resting membrane potential of -65 mV. You should match these events at the initial segment of a bipolar neuron. Please note that this is a sequence question. Although not an option below, you should consider that neurotransmitters are bound to ligand-gated receptors causing EPSPs. Now, put the process in the correct sequence: **arrange from 1-10