Neuroactive drugs, such as the antidepressant fluoxetine, function by affecting the activity of neurotransmitters in the brain. After the neurotransmitter serotonin has crossed the synapse and attached to the postsynaptic neuron, it is normally taken back up by vesicles in the presynaptic neuron. Fluoxetine inhibits this reuptake process, causing serotonin to remain in the synapse for longer than usual. A Synapse W. Nerve impulse 10) Which process labelled in the diagram above is inhibited by the action of fluoxetine? a) Process W b) Process X c) Process Y d) Process Z

Neuroactive drugs, such as the antidepressant fluoxetine, function by affecting the activity of neurotransmitters in the brain. After the neurotransmitter serotonin has crossed the synapse and attached to the postsynaptic neuron, it is normally taken back up by vesicles in the presynaptic neuron. Fluoxetine inhibits this reuptake process, causing serotonin to remain in the synapse for longer than usual. A Synapse W. Nerve impulse 10) Which process labelled in the diagram above is inhibited by the action of fluoxetine? a) Process W b) Process X c) Process Y d) Process Z

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 13RE

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Correct answer: Ligand-gated ion channel don’t open until the neurotransmitter diffuses across the synapse and binds to the receptor, The calcium channels are blocked in the presynaptic cells, It takes time for the vesicular exocytosis to occur Please explain why each of the correct answer choices are correct. Thank you.
The following steps refer to various stages in transmission at a chemical synapse. 1. Neurotransmitter binds with receptors associated with the postsynaptic membrane. 2. Calcium ions rush into neuron's cytoplasm. 3. An action potential depolarizes the membrane of the presynaptic axon terminal. 4. The ligand-gated ion channels open. 5. The synaptic vesicles release neurotransmitter into the synaptic cleft. Which step occurs first in transmission at a chemical synapse? Ostep 1 occurs first step 2 occurs first step 3 occurs first step 4 occurs first Ostep 5 occurs first
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An undisclosed drug (Drug A) is a drug that can block voltage-gated K+ channels when being introduced into the bloodstream. Explain the effects of Drug A on the action potentials produced by a neuron. If Drug A could be applied selectively to a presynaptic neuron that releases an excitatory neurotransmitter, analyse how would it alter the synaptic effect of the neurotransmitter on the presynaptic cell. Remark: The word count limit (250 words only), no less than 100 words
A chemical synapse is a type of synapse that occurs between two neurons and between a motor neuron and skeletal muscle fibers (i.e. at a Neuromuscular junction, NMJ). Compare and contrast the specific events that occur at chemical synapses at these two sites. Describe clearly how they are similar and how they are different, starting at the arrival of a nerve impulse at the pre-synaptic neuron and ending up with the changes observed at the postsynaptic membranes.
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Please answer question 37 Please select the most correct option
Please answer question 41
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
87.
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