During graded potential on the soma and dendrites, which of these channels are open? (Mark all...
During graded potential on the soma and dendrites, which of these channels are open? (Mark all that apply)
1. Na/K Pump
2. Voltage gated potassium channels
3. Ligand gated sodium channels
4. Voltage gated calcium channels
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During graded potential on the soma and dendrites, which of
these channels are open? (Mark all...
29 From the following graph, which channels/pumps are open/active at position 4? Mark all that apply...
29 From the following graph, which channels/pumps are open/active at position 4? Mark all that apply A. Na+/K+ Pump B. Voltage gated Na+ Channel C. Voltage gated K+ Channel D. Passive K+ channel E. None of the pump/channels are open/active Membrane potential (m)
Question 4 2 pts During and action potential, sodium (Na+) rushes into the cell causing of...
Question 4 2 pts During and action potential, sodium (Na+) rushes into the cell causing of the cell. Then sodium channels close and potassium (K+) rushes out of the cell, causing of the cell. However, the potassium overshoots and causes Question 5 2 pts During the refractory period, the pumps Na+ ions out of the cell and K+ions into the cell, re-establishing the resting membrane potential and concentration gradient. Serotonin Acetylcholine Glutamate Endorphins Barbiturates GABA Dopamine Cocaine Sodium Potassium Calcium...
Voltage-gated calcium channels are localized to which part of the neuron? axon terminal axon dendrites and...
Voltage-gated calcium channels are localized to which part of the neuron? axon terminal axon dendrites and soma all over the plasma membrane of the neuron
1. What triggers the opening of each of the different channels: ligand-gated K+ channels, ligand-gated Na+...
1. What triggers the opening of each of the different channels: ligand-gated K+ channels, ligand-gated Na+ channels, ligand-gated Cl- channels, voltage-gated Na+ channels, voltage-gated K+ channels, voltage-gated Ca2+ channels. 2. What happens to membrane potential in the immediate area where the channel is located when the channel opens and ions flow through? 3. Since graded and action potentials happen in different locations on the neuron, explain what has to happen to link these different events together.
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...
1) Which ligand-gated ion channels does (glutamate / GABA / glycine) open? 2) How do changes...
1) Which ligand-gated ion channels does (glutamate / GABA / glycine) open? 2) How do changes in (potassium / sodium) concentration affect the resting membrane potential? 3) If (sodium / potassium / chloride) channels are locked open, the membrane potential will continue to change due to ion flow until it reaches what value? (give a numerical value)
What is the main function of the sodium potassium pump in the neuron? a. Establish concentration...
What is the main function of the sodium potassium pump in the neuron? a. Establish concentration gradients for sodium and potassium ions. b. Depolarize the membrane to threshold. c. Make the inside of the cell more negative than the outside. d. Make the inside of the cell more positive than the outside. e. Pump ions down their concentration gradients during an action potential. A patient of yours has been poisoned by a toxin which prevents fast repolarization of the membrane...
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,...
Help! What might be the "stimulus" that initiates the action potential? Incorrect Question 10 0/1 pts...
Help! What might be the "stimulus" that initiates the action
potential?
Incorrect Question 10 0/1 pts Action potential +40 Voltage (mv) 5 Stimulus 1 4 2 3 Time (ms) What might be the "stimulus" that initiates the action potential? the activty of sodium/potassium ATPase the activty of calcium ATPase the activity of potassium ion channels the activity of ligand gated channels the activity of sodium ion channels
choices for A: Na+/K+ pumps, voltage gated K+ channels, voltage gated Ca+ channels, voltage gated Na+...
choices for A: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
choices for B: bidirectionally, unidirectionally
choices for C: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
choices for D: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
Consider this graph illustrating the generation of an action potential across the plasma membrane of a stimulated neuron. +40 ACTION POTENTIAL plasma membrane potential...
29 From the following graph, which channels/pumps are open/active at position 4? Mark all that apply A. Na+/K+ Pump B. Voltage gated Na+ Channel C. Voltage gated K+ Channel D. Passive K+ channel E. None of the pump/channels are open/active Membrane potential (m)
Question 4 2 pts During and action potential, sodium (Na+) rushes into the cell causing of the cell. Then sodium channels close and potassium (K+) rushes out of the cell, causing of the cell. However, the potassium overshoots and causes Question 5 2 pts During the refractory period, the pumps Na+ ions out of the cell and K+ions into the cell, re-establishing the resting membrane potential and concentration gradient. Serotonin Acetylcholine Glutamate Endorphins Barbiturates GABA Dopamine Cocaine Sodium Potassium Calcium...
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...
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,...
Help! What might be the "stimulus" that initiates the action
potential?
Incorrect Question 10 0/1 pts Action potential +40 Voltage (mv) 5 Stimulus 1 4 2 3 Time (ms) What might be the "stimulus" that initiates the action potential? the activty of sodium/potassium ATPase the activty of calcium ATPase the activity of potassium ion channels the activity of ligand gated channels the activity of sodium ion channels
choices for A: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
choices for B: bidirectionally, unidirectionally
choices for C: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
choices for D: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+ channels
Consider this graph illustrating the generation of an action potential across the plasma membrane of a stimulated neuron. +40 ACTION POTENTIAL plasma membrane potential...
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