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
Homework Answers
B all of the K+ voltage gated channels open. And this takes place during a relative refractory period. A new action potential can be initiated if the stimulus is stronger than the current action potential. Because voltage gated K+ channels are not closed.
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The peak of an action potential reaches +30 mV. This is
because
a. all of the...
The depolarization phase of the action potential of skeletal muscle cells ends when the ? a....
The depolarization phase of the action potential of skeletal muscle cells ends when the ? a. Na+ activation gates close. B. Na+ activation gates open. c. Na+ inactivation gates close. d. Na+ inactivation gates open. e. K+ voltage gated channels open. What is the correct choice.
25. A woman runs a marathon in 30°C weather and replaces all volume lost in sweat by drinking dis...
25. A woman runs a marathon in 30°C weather and replaces all volume lost in sweat by drinking distilled water. After th A) decreased total body water (TBW) B) decreased haematocrit C) decreased intracellular fluid (ICF) volume e marathon, she will have decreased plasma osmolarity increased intracellular osmolarity 26. Which of the following ions has a higher concentration in intracellular fluid (ICF) than in extracellular fluid (ECF)? C1 D) HC03 E) Ca2+ 27. One gram of mannitol was injected into...
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...
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,...
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...
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...
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...
CNCORA 6 of 10 > Action potentials in neurons involve opening and closing of voltage-gated Nat...
CNCORA 6 of 10 > Action potentials in neurons involve opening and closing of voltage-gated Nat and K ion channels. Place the events of an action potential in order, starting and ending with a cell at its resting membrane potential. Resting state Return to resting state Answer Bank A graded potential brings the membrane to threshold potential. Fast Na+ and slow K* channels are activated. Nat rushes into the cell, causing membrane depolarization. K channels close slowly, resulting in hyperpolarization....
all of them please Question z pus Action potential. How is the cell membrane able to...
all of them please
Question z pus Action potential. How is the cell membrane able to repolarize back to rest? influx of Na+ currents efflux of K+ currents influx of K+ currents efflux of Na+ currents Question 6 2 pts Neurons that convey motor commands to the bladder are visceral motor somatic motor visceral sensory somatic sensory Question 7 2 pts Action potential. During hyperpolarization the cell membrane is in a state of relative refractory period. the cell membrane is...
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...
25. A woman runs a marathon in 30°C weather and replaces all volume lost in sweat by drinking distilled water. After th A) decreased total body water (TBW) B) decreased haematocrit C) decreased intracellular fluid (ICF) volume e marathon, she will have decreased plasma osmolarity increased intracellular osmolarity 26. Which of the following ions has a higher concentration in intracellular fluid (ICF) than in extracellular fluid (ECF)? C1 D) HC03 E) Ca2+ 27. One gram of mannitol was injected into...
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,...
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...
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...
CNCORA 6 of 10 > Action potentials in neurons involve opening and closing of voltage-gated Nat and K ion channels. Place the events of an action potential in order, starting and ending with a cell at its resting membrane potential. Resting state Return to resting state Answer Bank A graded potential brings the membrane to threshold potential. Fast Na+ and slow K* channels are activated. Nat rushes into the cell, causing membrane depolarization. K channels close slowly, resulting in hyperpolarization....
all of them please
Question z pus Action potential. How is the cell membrane able to repolarize back to rest? influx of Na+ currents efflux of K+ currents influx of K+ currents efflux of Na+ currents Question 6 2 pts Neurons that convey motor commands to the bladder are visceral motor somatic motor visceral sensory somatic sensory Question 7 2 pts Action potential. During hyperpolarization the cell membrane is in a state of relative refractory period. the cell membrane is...
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...
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