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 application of TTX
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The neuron has a resting potential of – 60 mv and a threshold
potential at -40...
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?
Question 11 Not yet answered Marked out of 1.00 Flag question membrane potential (mV) ACTION POTENTIAL...
Question 11 Not yet answered Marked out of 1.00 Flag question membrane potential (mV) ACTION POTENTIAL threshold potential resting membrane potential depolarizing stimulus time (msec) STIMULUS What part of the action potential graph (indicated by Roman numerals) is mediated by delayed voltage-gated Na+ channels? Select one: O a. Il O b. I OC.IV O d. I and V Oe. Il and IV Question 12 Not yet answered Marked out of 1.00 Flag question +40 membrane potential (mv) ACTION POTENTIAL threshold...
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?
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.
@,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
D SCAN MATCHING 1. Depolarization 2. Action potential 3. Threshold 4. Repolarization 5. Relative refractory period...
D SCAN MATCHING 1. Depolarization 2. Action potential 3. Threshold 4. Repolarization 5. Relative refractory period 6. Absolute refractory period 7. Resting membrane potential 8. Continuous conduction 9. Saltatory conduction Choices A. a cell whose internal environment has an electrical charge equal to its external environment B. the process of a cell becoming positively charged C. the process of a cell becoming negatively charged D. an electrochemical change in the potential across a membrane that causes an electrical signal to...
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...
1. Draw a set of EPSPs and IPSPs that will initiate an action potential. You must...
1. Draw a set of EPSPs and IPSPs that will initiate an action potential. You must use at least 4 IPSPs to reach threshold and initiate an action potential. Use a normal action potential graph as an example. Each EPSP is +6 mV and each IPSP is -2 mV (I totally made these numbers up). You can put the EPSP and IPSP in any order, alternating or, however. Resting potential is -70mV and threshold is -50 mV. An example of...
Draw an action potential on a graph showing the x-axis and y-axis with proper labels and...
Draw an action potential on a graph showing the x-axis and y-axis with proper labels and numbers (the numbers are approximate as they may vary slightly from neuron to neuron). A. Describe the ionic conductances that underlie the action potential including gating of the specific ion channels at threshold, rising phase, falling phase and the undershoot phase. Explain threshold, absolute refractory period and relative refractory period in relation to the action potential. B. C. Sodium and potassium currents demonstrate very...
Human Physiology! Please help. Case Study: Mrs. Nguyen has high blood pressure. Her physician puts her...
Human Physiology! Please help.
Case Study: Mrs. Nguyen has high blood pressure. Her physician puts her on a medication that increases her urine flow rate (a diuretic) to help reduce her blood pressure. A side effect of this medication is that her plasma (ECF)K concentration drops from 4mM to 2.5 mM. 1. Using just the values for Na" and K' and assuming that her neurons are 25 times more permeable to potassium than to sodium, what is her neuron membrane...
Question 11 Not yet answered Marked out of 1.00 Flag question membrane potential (mV) ACTION POTENTIAL threshold potential resting membrane potential depolarizing stimulus time (msec) STIMULUS What part of the action potential graph (indicated by Roman numerals) is mediated by delayed voltage-gated Na+ channels? Select one: O a. Il O b. I OC.IV O d. I and V Oe. Il and IV Question 12 Not yet answered Marked out of 1.00 Flag question +40 membrane potential (mv) ACTION POTENTIAL threshold...
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.
@,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
D SCAN MATCHING 1. Depolarization 2. Action potential 3. Threshold 4. Repolarization 5. Relative refractory period 6. Absolute refractory period 7. Resting membrane potential 8. Continuous conduction 9. Saltatory conduction Choices A. a cell whose internal environment has an electrical charge equal to its external environment B. the process of a cell becoming positively charged C. the process of a cell becoming negatively charged D. an electrochemical change in the potential across a membrane that causes an electrical signal to...
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...
1. Draw a set of EPSPs and IPSPs that will initiate an action potential. You must use at least 4 IPSPs to reach threshold and initiate an action potential. Use a normal action potential graph as an example. Each EPSP is +6 mV and each IPSP is -2 mV (I totally made these numbers up). You can put the EPSP and IPSP in any order, alternating or, however. Resting potential is -70mV and threshold is -50 mV. An example of...
Draw an action potential on a graph showing the x-axis and y-axis with proper labels and numbers (the numbers are approximate as they may vary slightly from neuron to neuron). A. Describe the ionic conductances that underlie the action potential including gating of the specific ion channels at threshold, rising phase, falling phase and the undershoot phase. Explain threshold, absolute refractory period and relative refractory period in relation to the action potential. B. C. Sodium and potassium currents demonstrate very...
Human Physiology! Please help.
Case Study: Mrs. Nguyen has high blood pressure. Her physician puts her on a medication that increases her urine flow rate (a diuretic) to help reduce her blood pressure. A side effect of this medication is that her plasma (ECF)K concentration drops from 4mM to 2.5 mM. 1. Using just the values for Na" and K' and assuming that her neurons are 25 times more permeable to potassium than to sodium, what is her neuron membrane...
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