Long term depression in the hippocampus does NOT require which of the following? O Ca inflow O NMDA receptors O protein kinases O AMPA receptors presynaptic transmitter release
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- Which statement is true regarding chemical neurotransmission? O An IPSP closer to the soma will diminish the effects of an EPSP on a dendrite Chemical neurotransmission is mediated by gap junctions All neurotransmitter receptors are located on the postsynaptic cell membrane Neurotransmitters remain in the synaptic cleft indefinitelyBoth of these Neither of these QUESTION 28 During the process of muscle relaxation, changes to the sarcomere include: Increased size of the l-band Decreased size of the H-zone Increased size of the A-band All of the above OUESTION 30 Click Save and Submit to save and submit. Click Save All Answers to save all answers.The regulation of neurotransmitters DOES NOT include reuptake of the neurotransmission from the synaptic space degradation at the synaptic space O altering the rate of neurotransmitter release Ochanging the speed of receptor binding
- An EPSP facilitates depolarization of the postsynaptic membrane by O increasing the permeability of the membrane to K+. O stimulating the Na+-K+ pump. O allowing Cl- to enter the cell. O increasing the permeability of the membrane to Na+. O insulating the hillock region of the axon.In terms of function when a presynaptic neuron receiving input from a nearby inhibitory neuron, it can be inferred that the both neurons firing won't be synchronized activation of the inhibitory neuron is nullified activation of the presynaptic neurotransmitter release is enhanced this type of interaction represents a regulatory input of neuronal activationEach of the following contributes to the unidirectional propagation of nerve signals EXCEPT_ A) presynaptic neurotransmitter secretion is separated from postsynaptic receptors. dendrites only receive signals. action potentials initiate the hillock and propagate only down the axon. D neuron membranes have a refractory period following generation of an action potential. E ion channels are oriented to transport ions only into the neuron.
- IPSP differs from EPSP in :-a- being of shorter durationb- being unable o summate spatiallyc- moving the membrane potential away from thresholdd- depending upon opening of voltage K + channelsPostsynaptic receptors include all the following types, except :-a- G-protein coupled receptorsb- ligand-gated cation channelsc- G-protein regulated K + channelsd- voltage-gated Cl- channelsIf a post synaptic neuron is stimulated to threshold by spatial summation this implies that the post synaptic cell has a lower than normal threshold the postsynaptic cell has many synapses with many presynaptic neurons the post synaptic cell is getting stimulated many times during a short period of time by a single presynaptic neuron the post synaptic cell is slow to repolarize
- Gaba spillover from the inhibitory synapses can activate heteroreceptors and block presynaptic calcium channels in the excitatory axonal terminals TRUE OR FALSE Don't copy from GoogleLong-term potentiation of synaptic transmission :-a- is involved in pain control systemb- is caused by increased Ca ++ concentration in presynaptic neuronsc- results from fast repetitive stimulation of synapsed- is associated with decreased Ca ++ concentration in postsynaptic neuronsExcitatory neurons A and B both synapse with neuron C. Neuron A releasesa neurotransmitter, and neuron B releases the same type and amount ofneurotransmitter plus a neuromodulator that produces EPSPs in neuron C.Action potentials produced in neuron A alone can result in action potentialproduction in neuron C. Action potentials produced in neuron B alone alsocan cause action potential production in neuron C. Which results in moreaction potentials in neuron C, stimulation by only neuron A or stimulationby only neuron B? Explain.
