B Based on all the charges around a neuronal membrane, the resting membrane potential is closer to that of the potassium ion equilibrium potential than it is to the sodium ion potential. This is because the potassium equilibrium potential is enhanced by the presence of proteins potassium has a stronger charge the electrochemical force of potassium is stronger potassium's concentration gradient is much larger the membrane is more permeable to potassium

B Based on all the charges around a neuronal membrane, the resting membrane potential is closer to that of the potassium ion equilibrium potential than it is to the sodium ion potential. This is because the potassium equilibrium potential is enhanced by the presence of proteins potassium has a stronger charge the electrochemical force of potassium is stronger potassium's concentration gradient is much larger the membrane is more permeable to potassium

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter32: The Reception And Transmission Of Extracellular Information

Section: Chapter Questions

Problem 15P

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After an action potential, the opening of additional____voltage-gated ____ channels and The inactivation of sodium channels, cause the membrane to return to its resting membrane potential. sodium potassium calcium chloride
For a neuron to fire an action potential, its membrane must reach. hyperpolarization the threshold of excitation the refractory period inhibitory postsynaptic potential
Voltage-gated Na+ channels open upon leaching what state? resting potential threshold repolaiization overshoot
A(n)______neuron has one axon and one____ dendrite extending directly from the cell body. unipolar bipolar multipolar pseudounipolar
Which of the following voltages would most likely be measured during the relative refractory period? +30 mV 0 mV -45 mV -80 mv
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.
Neurons have a resting membrane potential of ___________________. varying votage as type and composition of channels can differ between neurons. theoretically the same votage because the ionic concentration is the same extracellularly and intracellularly for all neurons. equal to the equillibrium potential for potassium. directly opposing the equillibrium potential for sodium.
The giant axon of the squid (Figure Q11–3) occu-pies a unique position in the history of our understandingof cell membrane potentials and nerve action. When anelectrode is stuck into an intact giant axon, the membranepotential registers –70 mV. When the axon, suspended in abath of seawater, is stimulated to conduct a nerve impulse,the membrane potential changes transiently from –70 mVto +40 mV.
Graph of membrane potential versus time The graph above represent time in milliseconds. At what time (in milliseconds) is the inside of the neuron the most positive and why? Explain why the membrane potential changes at X. Explain what is happening at point C to the sodium and potassium ions and how this is affecting the membrane potential. Describe two things that contribute to the resting membrane potential.
3 If the membrane potential of a neuron drops to -55mV and sodium ions start to flow from outside to inside the neuron at this moment. How much energy will be released or used up during this flow of sodium ions if the concentration of sodium ions outside and inside the membrane was 1.5 M and 0.75 M respectively.
Compound X has been shown to block voltage-gated K+ channels with an IC50 of 0.1 mM. Which of the following is the most likely to occur in neurones following application of 0.03 mM X? Action potentials would be prolonged and the resting potential would be depolarised. Action potentials would be prolonged but the resting potential would remain the same. Neither resting potential nor action potentials would be affected because the concentration of X is less than the IC50 value. The resting membrane potential would depolarise but there would be no effect on action potentials.
Depolarisation & repolarisation in metaneuron - put the following events in order (from 1 to 4). Membrane potential crosses the threshold potential and an action potential is achieved. Depolarisation occurs when the applied current is sufficient to move membrane potential towards neutral. The neuron’s membrane potential drops below the initial resting membrane potential and temporarily becomes refractory to further action potentials. Membrane quickly repolarises by opening of K+ channels, allowing K+ions to leave the cell and charge separation to be re-established.