During excitatory synaptic transmission, the electrical signal carried along the axon of apresynaptic neuron causes the release of neurotransmitters into the synapse and its sub-sequent reception by receptors on the postsynaptic neurons. The activation of receptorson the postsynaptic neurons then triggers the generation of the new action potential inthat neuron.Both chemical and electrical neuronal signals are mediated by the movement of ionsacross the neuronal membrane. Which of the following correctly describes the movementof ions across neuronal membranes as an action potential is conducted down the neuron?ABсDAt rest, the internal side of the membrane has an overall positive charge, but as the ac-tion potential moves down the neuron, more ions flow out of the neuron to neutralizethe membrane.At rest, the internal side of the membrane has an overall positive charge, but as the ac-tion potential moves down the neuron, more ions flow into the neuron making themembrane more positive.At rest, the internal side of the membrane has an overall positive charge, which intensi-fies the action potential.At rest, the internal side of the membrane has an overall negative voltage. As the actionpotential moves down the neuron, the internal membrane becomes positive as ionchannels open and ions flow into the neuron.

The point of electric nerve impulse transmission between two nerve cells (neurons), or between a…

During excitatory synaptic transmission, the electrical signal carried along the axon of a presynaptic neuron causes the release of neurotransmitters into the synapse and its sub- sequent reception by receptors on the postsynaptic neurons. The activation of receptors on the postsynaptic neurons then triggers the generation of the new action potential in that neuron. Both chemical and electrical neuronal signals are mediated by the movement of ions across the neuronal membrane. Which of the following correctly describes the movement of ions across neuronal membranes as an action potential is conducted down the neuron?

During excitatory synaptic transmission, the electrical signal carried along the axon of a presynaptic neuron causes the release of neurotransmitters into the synapse and its sub- sequent reception by receptors on the postsynaptic neurons. The activation of receptors on the postsynaptic neurons then triggers the generation of the new action potential in that neuron. Both chemical and electrical neuronal signals are mediated by the movement of ions across the neuronal membrane. Which of the following correctly describes the movement of ions across neuronal membranes as an action potential is conducted down the neuron?

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)
When action potentials arrive at a synapse between a neuron and another cell, they stimulate the release of molecules of a ________ that diffuse over to that cell.
which one of the following statements is incorrect? a. temporal summation occurs when a single synaptic input is activated twice in succession, with the second postsynaptic potential occurring before the first postsynaptic potential is over. b. blocking voltage-gated k* channels in the presynaptic membrane of a typical chemical synapse is likely to reduce the amount of neurotransmitter released in response to a single action potential in the presynaptic axon. c. in the optic tectum of the hunting rattlesnake, spatial summation is used to combine inputs from visual and thermoreceptive layers in order to make a decision whether to strike at a mouse-like object. d. a single type of neurotransmitter can have different postsynaptic actions depending on the type of receptor to which it binds.
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 effect would you expect an antagonist that targets the voltage sensing domain of perisynaptic calcium channels of an inhibitory interneuron have on the firing frequency of a finically active neuron that interneuron synapses onto? Explain in details
In chemical synapses, transmission occurs in a forward direction because :-a- neurotransmitter receptors are found only in the postsynaptic membraneb- the subsynaptic membrane does not contain neurotransmitter vesiclesc- the subsynaptic membrane is more sensitive than the membrane of synaptic knob to the effect of neurotransmittersd- the subsynaptic membrane contains both ligand-gated and voltage-gated ionic channels
During a relative refractory period of an action potential A. Another action potential can be fired, it just takes a greater stimulus for the membrane potential to reach threshold B. Na+ channels are either already open or are inactivated therefore the membrane absolutely can not produce another action potential, no matter how intense the stimulus C. Ca++ flows out of the cell, causing hyperpolarization and a need for a greater stimulus to generate the action potential D. The presynaptic neuron "tells" the postsynaptic neuron about the "relative" strength of signal E. None of the above are correct
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.
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?
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.