What is the significance of CNS and PNS. What is the significance of the neurotransmitter release at the neuromuscular junction and their action.
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What is the significance of CNS and PNS. What is the significance of the neurotransmitter release at the neuromuscular junction and their action.
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- In neurology, please explain the relationship between extraceullalar calcium concentration and post synaptic potential. does higher extra cellular calcium concentration means bigger change in postsynaptic potential and lower extra cellular calcium concentration means smaller change in postsynaptic potential? Please explain in a few sentences.If a pre-synaptic cell releases a large amount of excitatory neurotransmitter into the synaptic cleft, how will that affect the PSPs? Does that large release ensure that the postsynaptic cell will initiate an action potential, and what role does the axon hillock play in this process/decision?Which of the following statements about action potentials and information transmission in the synaptic cleft is FALSE? 1. Action potentials determine the amount of neurotransmitters that are released into the synaptic cleft 2.Action potentials ultimately result in more calcium leaving the target cell at the postsynaptic membrane 3. Action potentials determine the duration that neurotransmitters are released into the synaptic cleft 4. Action potentials ultimately result in more calcium entering the neuron at the axon terminal
- Describe the resting potential for neurons. How is this potential established? Describe the development of the action potential. How does this come about, and what is the function of this phenomenon? Include a diagram of the various stages of the action potential, showing the changes in voltage that occur throughout this phenomenonhe rate of conduction of an action potential along a nerve fiber is affected by a range of things. Which of the following affects the rate of conduction? (can choose multiple answers) 1. Myelin 2. nerve diamter 3. nerve length 4. temperatureSynaptic terminal Neurotransmitter SENDING NEURON Vesicle Calcium channel Receptor for neurotransmitter RECEIVING NEURON Synaptic cleft
- Which of the following statements are true with regards to the differences between a neuromuscular junction, and a standard central nervous system (CNS) synapse? Select all that apply. O The neuromuscular junction is a synapse between a neuron (alpha motor neuron) and a muscle fibre. CNS synapses connect two neurons. The graded potential generated by a neuromuscular junction has a much larger voltage than that of a CNS synapse. The structure of the neuromuscular junction ensures that an action potential in the alpha motor neuron always results in an action potential in the post-synaptic muscle fibre. CNS synapses do not guarantee this. The neuromuscular junction always uses Acetylcholine as a neurotransmitter, whereas CNS synapses may use a variety of neurotransmitters depending on their location and functionHow is neurotransmitter removed from the synaptic cleftIf action potential propagation from one neuron to another neuron requires ACh release, what event at the synaptic cleft explains the need for action potentials to arrive at a high rate before the post-synaptic membrane achieves threshold? the lack of sodium voltage gated channels on the post-synaptic membrane O the rapid breakdown of ACh by ACHE at the synaptic cleft the slow release of ACh by the synaptic vessicles the slow movement of sodium through chemical gates Previous Next MacBook Air
- What determines the effect of neurotransmitter release on the post-synaptic neurons? * 1 point the size of the action potential. the post-synaptic receptors the neurotransmitter contained in the synaptic vesicles. the concentration of calcium ions reached in presynaptic terminals. the size of the synaptic vesicles.Synaptic fatigue is due to : -a- decreased synthesis of neurotransmittersb- inability to release neurotransmitters by exocytosisc- failure of action potentials to open voltage-gated Ca ++ channels in presynaptic terminald- imbalance in between rates of synthesis and release of neurotransmittersIs the resting membrane potential the bases of conduction in nerves and muscle fibers and the presecutors of contraction in muscles?