A neuron has received enough stimulation to fire an action potential; it also has been treated...
Homework Answers
Tetraethylammonium TEA blocks k ion channels and would not allow the neurones to reach resting potential. Repolarization is not possible in the presence of TEA and the neurones becomes non functional.
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neuron has received enough stimulation to fire an action potential;
it also has been treated...
An action potential may be initiated in a neuron when [SELECT ONE "antagonist", "a neurotransmitter", "nerve...
An action potential may be initiated in a neuron when [SELECT ONE "antagonist", "a neurotransmitter", "nerve impulse"] binds to a [SELECT ONE "ligand-gated", "open", "Na+/K+"] ion channel that serves as a [ SELECT ONE "receptor", "channel", "ligand"]
Neuron Signaling and Muscle Contraction 1) “Dissect” the various parts of an action potential by describing...
Neuron Signaling and Muscle Contraction 1) “Dissect” the various parts of an action potential by describing the status (active or nonactive) of the voltage-gated sodium channel, voltage-gated potassium channel, sodium/potassium pump, and overall voltage and/ or voltage range (in millivolts, or mV) for each of the following. A) Resting membrane (prior to the initiation of an action potential) B) just before threshold to just after threshold (Depolarization) C) Rising phase of the action potential D) Falling phase of the action...
2. Neuron during an action potential: a. What triggers the first action potential (which ion)? b....
2. Neuron during an action potential: a. What triggers the first action potential (which ion)? b. What is the typical threshold potential of a neuron? c. The calculated equilibrium potential of Na+ (EN) is approx. +60mV (calculated). Explain how this is related to the rising phase of an action potential (depolarization). d. The calculated equilibrium potential of K+ (EK) is approx. -90mV. Explain how this is related to the falling phase (repolarization). e. Direction of Nation movement (influx/efflux). f. Direction...
During the propagation of an action potential, what would be the effect of a mutation in...
During the propagation of an action potential, what would be the effect of a mutation in the voltage-gated Na+-channels that does not allow “inactivation” phase to occur, such that these channels go directly from open to closed conformations? a) The neuron with the mutant Na+ channels will start letting in calcium ions and generate a calcium-based action potential that is stronger than the sodium-based action potential. b) The neuron with the mutant Na+ channel will exhibit a reverse electrochemical gradient...
Describe how an action potential occurs in a neuron and any ions which are involved. Also...
Describe how an action potential occurs in a neuron and any ions which are involved. Also explain the following graph at each point. | Voltage (mv) Time (ms)
A neuron has a resting membrane potential of -70 mV; it’s trigger threshold for firing an...
A neuron has a resting membrane potential of -70 mV; it’s trigger threshold for firing an action potential is -50 mV. Two competing signals arrive simultaneously in the trigger zone: one is a depolarizing stimulus of +40 mV, the other a hyperpolarizing stimulus of -25 mV. Will the neuron fire an action potential after integrating these signals? Why?
You observe that a neuron treated with a metabolic inhibitor which prevents ATP generation still can...
You observe that a neuron treated with a metabolic inhibitor which prevents ATP generation still can generate action potentials even when the cell has little ATP, but the neuron eventually loses the ability to generate action potentials. What does this tell you about the direct mechanism for regenerating the resting potential after an action potential?
What is a resting potential? Is it positive or negative? The resting potential is mainly due...
What is a resting potential? Is it positive or negative? The resting potential is mainly due to the main _____-charged large molecules stuck inside the neuron. The Na+/K+ pump pushes Na+ _____ of the cell and K+ ____ of the cell (in or out for each ion) Where is K+ concentrated, inside or outside of the neuron? Where is Na+ concentrated, inside or outside of the neuron? The action potential starts with an rise in membrane voltage. This is due...
5. Did you notice that during the action potential the neuron membrane potential reaches -90mV and...
5. Did you notice that during the action potential the neuron membrane potential reaches -90mV and stops? How/why does it stop at -90mV? Why doesn't it get more negative than -90mV? Hint: When the voltage-gated K+ channels are open on a neuron, there are so many voltage- gated K+ channels open that in reality you can think of the cell as being only permeable to K+. It's the main ion moving. Based on this and what we talked about on...
Once an action potential has been induced for taste, the action potential goes from the taste bud directly to the primar...
Once an action potential has been induced for taste, the action potential goes from the taste bud directly to the primary gustatory area. True or False
2. Neuron during an action potential: a. What triggers the first action potential (which ion)? b. What is the typical threshold potential of a neuron? c. The calculated equilibrium potential of Na+ (EN) is approx. +60mV (calculated). Explain how this is related to the rising phase of an action potential (depolarization). d. The calculated equilibrium potential of K+ (EK) is approx. -90mV. Explain how this is related to the falling phase (repolarization). e. Direction of Nation movement (influx/efflux). f. Direction...
Describe how an action potential occurs in a neuron and any ions which are involved. Also explain the following graph at each point. | Voltage (mv) Time (ms)
5. Did you notice that during the action potential the neuron membrane potential reaches -90mV and stops? How/why does it stop at -90mV? Why doesn't it get more negative than -90mV? Hint: When the voltage-gated K+ channels are open on a neuron, there are so many voltage- gated K+ channels open that in reality you can think of the cell as being only permeable to K+. It's the main ion moving. Based on this and what we talked about on...
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