WHAT IF? Ouabain, a plant substance used in some cultures topoison hunting arrows, disables the sodium-potassium pump.What change in the resting potential would you expect to seeif you treated a neuron with ouabain? Explain.
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WHAT IF? Ouabain, a plant substance used in some cultures to
poison hunting arrows, disables the sodium-potassium pump.
What change in the resting potential would you expect to see
if you treated a neuron with ouabain? Explain.
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- Please ASAP. Thanku If one increases the intracellular concentration of Na+ around a neuron, what would happen to the resting membrane potential? I am not sure No effect Becomes more positive Less positivePlease ASAP. Thanku If one increases the intracellular concentration of Na+ around a neuron, what would happen to the resting membrane potential? Ion Extracellular Concentration (mM) Intracellular Concentration (mM) Na+ 440 50 K+ 20 400 Cl- 560 52 Ca++ 10 1 I am not sure No effect Becomes more positive Less positivePlease ASAP. Thank you. A hypothetical neuronal cell shows the following intracellular and extracellular concentration of sodium, potassium, calcium, and chloride ions. Extracellular concentration (mM) Intracellular concentration (mM) (Ion)out/ (Ion)inside E ion at 37 oC Sodium ion 420 60 Potassium ion 25 420 Calcium ion 16 0.4 Chloride 565 45 How does increase in the extracellular potassium concentration to 250 mM affect the Nernst potential? Why?
- Watch this video (http://openstaxcollege.org/l/summation) to learn about summation. The process of converting electrical signals to chemical signals and back requires subtle changes that can result in transient increases or decreases in membrane voltage. To cause a lasting change in the target cell, multiple signals are usually added together, or summated. Does spatial summation have to happen all at once, or can the separate signals arrive on the postsynaptic neuron at slightly different times? Explain your answer.4. Na+ channels and Action Potential Initiation. Action potentials are often initiated at the axon hillock, where the axon leaves the cell body. The axon hillock has a high density of Na+ channels, which lowers the threshold for initiating an action potential. MetaNeuron can be used to measure the effect of Na+ channel density on the threshold of action potential generation. Vary "gNa max" from 200 to 380 mS/cm2 in 20 mS/cm2 steps. (Na+ channel density is proportional to gNa max.) For each "gNa max" value, determine the threshold stimulus amplitude (in μA) for initiating an action potential. Plot the threshold current as a function of gNa max. Why does the action potential threshold vary as Na+ channel density is changed? 5. Action Potential Membrane Conductances. Starting with the default parameter values. Select "Show ionic conductances" in the "Conductances and Currents" window. The green and blue Iraces show the time course of the Na+ and K+ conductances that are activated during…Please ASAP. Thanks Ion Extracellular Concentration (mM) Intracellular Concentration (mM) Na+ 440 50 K+ 20 400 Cl- 560 52 Ca++ 10 1 What is the effect of the addition of extracellular TTX and TEA on equilibrium potential? TTX blocks K channel, and TEA blocks Na Channels. No change in the equilibrium potentail. TTX blocks Na channel and TEA blocks K Channels. The equilibrium potentials become less positive TTX blocks Na channel and TEA blocks K Channels. The equilibrium potential becomes more positive for both TTX blocks Na channel and TEA blocks K Channels. No change in the equilibrium potentail. TTX and TEA blocks Na channel. No change in the equilibrium potentail.
- F Which refers to the time during which a neuron can undergo an action potential? O the resting membrane potential ↑ 11 @ #3 the depolarization period of the neuron polarization period of the neuron Transmission of the nerve impulse across the synapse is accomplished by which of the following? 2@ 3 £ the membrane potential sodium-potassium pump release of a neurotransmitter by a dendrite 1 release of a neurotransmitter by an axon release of a neurotransmitter by the cell body 54 2 $ % 4¢ 5 ¤ V6 31 acer Oll O & 6- 71 8² * 00 69 93 xA theoretical drug blocks Na* leak channels - what effect would this have on a neuron's resting membrane potential and why? Would this drug affect the neuron's ability to generate an action potential and why/why not?Action Refractory potential period 50 6. 50 9. 5. -10. -100 2 3 4 Time (milliseconds) 1 5 6 7 Action Potential in a Neuron Place the number from the graph that matches the description in the blank below. The voltage gated sodium channels are open. The threshold level of the neuron is represented by the number: The sodium channels have closed. The potassium channels are open and potassium ions are flowing out. The potassium channels are slow to close. The membrane potential is more negative than the resting membrane potential. Membrane Potential (mV)
- voltmeter microelectrode electrode Giant squid axon A voltmeter was used to measure the potential difference across the cell membrane of a giant squid axon. Which of the following best explains the voltmeter reading? Select one: a. The threshold potential has not been reached. b. The sodium potassium exchange pumps are working to take out the sodium ions and bring in the potassium ions. c. The potassium ions have rushed out of the axon, and the potassium channels are slow to shut down. d. The sodium ions have rushed into the axon, and the sodium channels are closing.B EPSP EPSP IPSP Y Axon hillock Axon Will it be likely to produce an action potential in neuron Y if there is repeated rapid and successive firing from neuron B? Why? What is the phenomenon called? What is the ionic basis of IPSP? Name ONE neurotransmitter that is likely to be released by inhibitory neuron C. One EPSP from neuron A depolarizes the initial segment of a neuron by +2 mV, one EPSP from neuron B is +3 mV. If there is a spatial summation of 3 EPSPS each from neurons A and B, will an action potential be generated in neuron Y? The resting membrane potential of Y is -70 mV and threshold is at -60 mV.1. The graph above represent time in milliseconds. At what time (in milliseconds) is the inside of the neuron the most positive and why? 2. Explain why the membrane potential changes at X 3. Explain what is happening at point C to the sodium and potassium ions and how this is affecting the membrane potential 4. Describe two things that contribute to the resting membrane potential