Homework Answers
Voltage Gated Sodium channels are found within the plasma membrane of nerve cell axons. Their main role is to induce an action potential. The Na+ VGC can occupy 3 states: Open, inactive and closed. Voltage-gated sodium channels are responsible for action potential initiation and propagation in excitable cells, including nerve, muscle, and neuroendocrine cell types.
Therefore, Option C is correct.
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13. Which structure is most responsible for the all-or-none property of the action potential? a. Myelin...
During an action potential, which of the following actions does not help return the membrane to...
During an action potential, which of the following actions does not help return the membrane to its resting potential? Choose one: O A. the inactivation of voltage-gated Nat channels O B. the opening of voltage-gated K+ channels O C. the opening of voltage-gated Nat channels O D. the flow of K+ through K+ leak channels
For each phase of an action potential, indicate the ion channel most responsible for the membrane...
For each phase of an action potential, indicate the ion channel most responsible for the membrane potential change that occurs during the phase. Action Potential Phases Ion Channels Depolarization phase Repolarization phase Hyperpolarization phase Voltage-gated potassium channels Chemically-gated sodium channels Chemically-gated potassium channels Voltage-gated sodium channels
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...
Ion channels are involved with generating action potentials. Below is an electrical profile of a neuronal action potent...
Ion channels are involved with generating action potentials. Below is an electrical profile of a neuronal action potential. In the boxes below list whether the channels are all open, all closed, opening, or closing at each of the letters shown in the profile. (Opening implies that channels were "all closed" and are moving toward their "all open" state. Closing indicates the opposite. Use the term "closing" to represent the inactivated state of the Na+ channels.) (7 pts) 1. Channel Type...
3. Many neurons contain "delayed K channels". Like voltage-gated Nat channels, these voltage-gated K+ channels open in response to a rise in membrane potential and then undergo inactivati...
3. Many neurons contain "delayed K channels". Like voltage-gated Nat channels, these voltage-gated K+ channels open in response to a rise in membrane potential and then undergo inactivation. However, opening of the voltage-gated K channels lags behind opening of the voltage-gated Na channels. a) Why does neuronal function require the voltage-gated K channels to open more slowly than the voltage-gated Na channels? b) Compared to a neuron that lacks voltage-gated K channels, what differences would you expect in the shape...
Efer Figure2 to answer questions 18-21: 8. produce the myelin sheaths of neurons in the central F...
efer Figure2 to answer questions 18-21: 8. produce the myelin sheaths of neurons in the central Figure 2 nervous system. 19 form the Blood Brain Barrier 20._ are responsible for neurotransmitter release. 21 have ligand gated ion channels that are activated by neurotransmitters 22. Functionally, which cellular location is the neuron's "decision- making site" as to whether or not an action potential will be initiated? A axonal membrane B. axon hillock C. dendritic membrane D. presynaptic membrane 23. Calcium and...
The fixed pattern of changes in membrane potential during an action potential is coordinated by the...
The fixed pattern of changes in
membrane potential during an action potential is coordinated by the
sequential opening and closing of voltage-gated ion channels. Can
you identify the status (open/closed) of the voltage-gated Na+ and
K+ channels during each phase of an action potential? Drag the
appropriate labels onto the graph to indicate the status (open or
closed) of the voltage-gated Na+ and K+ channels during each phase
of an action potential. Labels may be used once, more than once,...
Multiple Choice Action potentials A) rapid reversal of membrane potential B) occurs at nodes of ranvier...
Multiple Choice Action potentials A) rapid reversal of membrane potential B) occurs at nodes of ranvier C) occurs along myelin sheath D) dependent on voltage gated channels E) occurs at axon hillock
The peak of an action potential reaches +30 mV. This is because a. all of the...
The peak of an action potential reaches +30 mV. This is because a. all of the available Na+ voltage activation gates are open b. all of the K+ voltage-gated channels open c. of the absolute refractory period d. of the decreased Na+ concentration gradient e. all of the available Na+ voltage inactivation gates are closed
Q3 During the action potential, the cell depolarizes and goes back to the resting potential after...
Q3 During the action potential, the cell depolarizes and goes back to the resting potential after a little hyperpolarization caused by O A The enter of Na+ through the Na+ channels OBThe enter of Na+ through the voltage-gated Na+ channels O cThe exit of K+ through the voltage-gated K+ channels O D The enter of Ca+ through the voltage-gated Ca+ channels
During an action potential, which of the following actions does not help return the membrane to its resting potential? Choose one: O A. the inactivation of voltage-gated Nat channels O B. the opening of voltage-gated K+ channels O C. the opening of voltage-gated Nat channels O D. the flow of K+ through K+ leak channels
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...
Ion channels are involved with generating action potentials. Below is an electrical profile of a neuronal action potential. In the boxes below list whether the channels are all open, all closed, opening, or closing at each of the letters shown in the profile. (Opening implies that channels were "all closed" and are moving toward their "all open" state. Closing indicates the opposite. Use the term "closing" to represent the inactivated state of the Na+ channels.) (7 pts) 1. Channel Type...
3. Many neurons contain "delayed K channels". Like voltage-gated Nat channels, these voltage-gated K+ channels open in response to a rise in membrane potential and then undergo inactivation. However, opening of the voltage-gated K channels lags behind opening of the voltage-gated Na channels. a) Why does neuronal function require the voltage-gated K channels to open more slowly than the voltage-gated Na channels? b) Compared to a neuron that lacks voltage-gated K channels, what differences would you expect in the shape...
efer Figure2 to answer questions 18-21: 8. produce the myelin sheaths of neurons in the central Figure 2 nervous system. 19 form the Blood Brain Barrier 20._ are responsible for neurotransmitter release. 21 have ligand gated ion channels that are activated by neurotransmitters 22. Functionally, which cellular location is the neuron's "decision- making site" as to whether or not an action potential will be initiated? A axonal membrane B. axon hillock C. dendritic membrane D. presynaptic membrane 23. Calcium and...
The fixed pattern of changes in
membrane potential during an action potential is coordinated by the
sequential opening and closing of voltage-gated ion channels. Can
you identify the status (open/closed) of the voltage-gated Na+ and
K+ channels during each phase of an action potential? Drag the
appropriate labels onto the graph to indicate the status (open or
closed) of the voltage-gated Na+ and K+ channels during each phase
of an action potential. Labels may be used once, more than once,...
Multiple Choice Action potentials A) rapid reversal of membrane potential B) occurs at nodes of ranvier C) occurs along myelin sheath D) dependent on voltage gated channels E) occurs at axon hillock
Q3 During the action potential, the cell depolarizes and goes back to the resting potential after a little hyperpolarization caused by O A The enter of Na+ through the Na+ channels OBThe enter of Na+ through the voltage-gated Na+ channels O cThe exit of K+ through the voltage-gated K+ channels O D The enter of Ca+ through the voltage-gated Ca+ channels
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