In terms of function when a presynaptic neuron receiving input from a nearby inhibitory neuron, 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 activation t can be

In terms of function when a presynaptic neuron receiving input from a nearby inhibitory neuron, 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 activation t can be

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 4TAHL: Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and...

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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.
A neuron responds to adequate stimulation with _______, a type of self-propagating signal.
Stellate cells initially process sensory input to the cortex, whereas pyramidal cells send fibers from the cortex to terminate on efferent motor neurons. (True or false)
Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. Golgibodies
. Suppose a particular neurotransmitter causes an IPSP inpostsynaptic cell X and an EPSP in postsynaptic cell Y. A likelyexplanation is that(A) the threshold value in the postsynaptic membraneis different for cell X and cell Y.(B) the axon of cell X is myelinated, but that of cell Y is not.(C) only cell Y produces an enzyme that terminates the activityof the neurotransmitter.(D) cells X and Y express different receptor molecules for thisparticular neurotransmitter.
Which of the following is the most direct result of depolarizingthe presynaptic membrane of an axon terminal?(A) Voltage-gated calcium channels in the membrane open.(B) Synaptic vesicles fuse with the membrane.(C) Ligand-gated channels open, allowing neurotransmittersto enter the synaptic cleft.(D) An EPSP or IPSP is generated in the postsynaptic cell.
Ordinarily, a neuron’s trigger zone is activated before any other part ofan axon, so a wave of action potentials occurs as sodium channelsopen in the direction of the synaptic terminal. What would happen ifyou artificially stimulated an axon to reach threshold potential midwayalong its length rather than at the trigger zone?a. Action potentials would occur in the direction of the synapticterminal.b. No action potentials would occur.c. Action potentials would occur in the direction of the trigger zone.d. Both a and c are correct.
When a postsynaptic neuron is adequately stimulated, action potentials develop at the initial segment of the axon because :-a- it contains many voltage-gated Na + channelsb- it contains the highest concentration of ligand-gated cation channelsc- it contains many voltage-gated Ca ++ channelsd- it is more sensitive to the direct stimulant effect of neurotransmitters
Transmission of the nerve impulse across a synapse isaccomplished bya. the release of Na+ at the presynaptic membrane.b. the release of neurotransmitters at the postsynaptic membrane.c. the reception of neurotransmitters at the postsynapticmembrane.d. Both a and c are correct.
For a neuron to fire an action potential, its membranemust reach ________.a. hyperpolarizationb. the threshold of excitationc. the refractory periodd. inhibitory postsynaptic potential
Excitatory 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.
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.