For a neuron with an initial membrane potential at -70 mV, an increase in the movement...
For a neuron with an initial membrane potential at -70 mV, an increase in the movement of potassium ions out of that neuron's cytoplasm would result in
Homework Answers
For a neuron with an initial membrane potential at -70 mV, an increase in the movement of K+ ions out of that neuron's cytoplasm would result in HYPERPOLARIZATION as the inside of the membrane becomes negative as potassium goes out of the cell and that reduces a chance that neuron will transmit a nerve impulse.
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For a neuron with an initial membrane potential at -70 mV, an
increase in the movement...
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?
A hypothetical neuron has the following properties: ENo +40mV: Ea -70 mV; Ex -85 mV. (5...
A hypothetical neuron has the following properties: ENo +40mV: Ea -70 mV; Ex -85 mV. (5 pts) i. If the membrane were permeable only to potassium, what would be the resting membrane potential? What would happen to ENa if the external sodium concentration was lowered (with internal concentration of sodium remaining the same)? Explain your answer ii. ili. Use the constant field equation to calculate the RMP given a PNa:PK:PCI permeability ratio of 1 :0.04 0.45. Show your work.
Neuron celts generate electrical signals electrical potential across the cell membrane? Body temp...
Neuron celts generate electrical signals electrical potential across the cell membrane? Body temperature is 310 K. The sign idenones the change in the clectrca granents across membranes Assung a potassum k n concermation of O00250 М nside the ceu, and a concentaton of O 135 Moutsoe the cet wnat is the potentat accoss the membrane and wnich way the ions now (answer in mv) Ansner Check Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion...
The resting membrane potential of a neuronal axon is -70 mV. When an action potential is...
The resting membrane potential of a neuronal axon is -70 mV. When an action potential is triggered, Na+ ions move into the axon, which reverses the voltage, bringing it towards 0 mV. Which of the following is the correct term for this sequence of events? a. Repolarization b. Hyperpolarization c. Depolarization d. Hypopolarization e. Isopolarization
The resting membrane potential of cardiac muscle cells (the contractile cells) is approximately -90 mV. The...
The resting membrane potential of cardiac muscle cells (the contractile cells) is approximately -90 mV. The resting membrane potential of typical neurons is approximately -60 to -70 mV. Why is the resting potential of cardiac muscle cells lower than that of a typical neuron?
Discuss the steps in generating an action potential in a neuron. (Make sure to include which...
Discuss the steps in generating an action potential in a neuron. (Make sure to include which ion channels are activated and how, changes in membrane potential as a result of the movement of those ions, the different phases seen in an action potential, and the movement of the action potential in relation to the anatomy of a neuron.).
@,0 ,0 ,0 at 25°C. The membrane potential of the neuron is -60 mV. Assuming the...
@,0 ,0 ,0 at 25°C. The membrane potential of the neuron is -60 mV. Assuming the neuronal cell membrane has channels that allow facilitated diffusion of Cl, do you expect Cl to flow into the cell? Explain your answer and provide quantitative support for your answer (i.e. show calculations). 10. A neuron with an intracellular Ch concentration of 30 mM is placed in a solution that contains 120 mM CI
2. Explain how the resting membrane potential of a neuron is established by a. Listing the...
2. Explain how the resting membrane potential of a neuron is established by a. Listing the important ions/molecules that contribute to the establishment of the membrane potential (there are 4) Describing which direction the ions/molecules flow (if at all; in or out of the cell?) Telling me which one of the ions/molecules is the MOST important for establishing the resting membrane potential and WHY b. c. Explaining how this ONE important ion/molecule flows through the membrane by describing the opposing...
1) In a regular neuron, the Nernst potential of K+ is about -90 mV. If a...
1) In a regular neuron, the Nernst potential of K+ is about -90 mV. If a scientist utilizes a drug that adheres to and blocks 50% of K+ leak channels, what will the new Nernst potential of K+ be? 0 mV -45 mV -90 mV -135 mV -180 mV 2) If the number of ion channels in the membrane is decreased, which of the following would happen? Select all choices that would apply The length constant increases. The length constant...
The neuron has a resting potential of – 60 mv and a threshold potential at -40...
The neuron has a resting potential of – 60 mv and a threshold
potential at -40 mv. The ENa is approximately at +40 mv. In every
case, the stimulus is initiated at 2 ms, and lasts for 1 ms. Draw
the membrane potentials from 0 to 10 ms for the following scenarios
in each of the boxes above.
a) 15 mv depolarizing stimulus
b) 25 mv hyperpolarizing stimulus
c) 30 mv depolaring stimulus
d) 30 mv depolarizing stimulus after the...
A hypothetical neuron has the following properties: ENo +40mV: Ea -70 mV; Ex -85 mV. (5 pts) i. If the membrane were permeable only to potassium, what would be the resting membrane potential? What would happen to ENa if the external sodium concentration was lowered (with internal concentration of sodium remaining the same)? Explain your answer ii. ili. Use the constant field equation to calculate the RMP given a PNa:PK:PCI permeability ratio of 1 :0.04 0.45. Show your work.
Neuron celts generate electrical signals electrical potential across the cell membrane? Body temperature is 310 K. The sign idenones the change in the clectrca granents across membranes Assung a potassum k n concermation of O00250 М nside the ceu, and a concentaton of O 135 Moutsoe the cet wnat is the potentat accoss the membrane and wnich way the ions now (answer in mv) Ansner Check Neuron cells generate electrical signals by concentration gradients across membranes. Assuming a potassium ion...
@,0 ,0 ,0 at 25°C. The membrane potential of the neuron is -60 mV. Assuming the neuronal cell membrane has channels that allow facilitated diffusion of Cl, do you expect Cl to flow into the cell? Explain your answer and provide quantitative support for your answer (i.e. show calculations). 10. A neuron with an intracellular Ch concentration of 30 mM is placed in a solution that contains 120 mM CI
2. Explain how the resting membrane potential of a neuron is established by a. Listing the important ions/molecules that contribute to the establishment of the membrane potential (there are 4) Describing which direction the ions/molecules flow (if at all; in or out of the cell?) Telling me which one of the ions/molecules is the MOST important for establishing the resting membrane potential and WHY b. c. Explaining how this ONE important ion/molecule flows through the membrane by describing the opposing...
The neuron has a resting potential of – 60 mv and a threshold
potential at -40 mv. The ENa is approximately at +40 mv. In every
case, the stimulus is initiated at 2 ms, and lasts for 1 ms. Draw
the membrane potentials from 0 to 10 ms for the following scenarios
in each of the boxes above.
a) 15 mv depolarizing stimulus
b) 25 mv hyperpolarizing stimulus
c) 30 mv depolaring stimulus
d) 30 mv depolarizing stimulus after the...
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