Potassium leak is a major determinant of resting membrane potential. What happens to the resting membrane potential when the intracellular concentration of potassium is increased to 120 mM? O a. It has no impact on the resting membrane potential O b. The resting membrane potential becomes more negative OC. The resting membrane potential becomes more positive O d. The resting membrane potential collapses

Potassium leak is a major determinant of resting membrane potential. What happens to the resting membrane potential when the intracellular concentration of potassium is increased to 120 mM? O a. It has no impact on the resting membrane potential O b. The resting membrane potential becomes more negative OC. The resting membrane potential becomes more positive O d. The resting membrane potential collapses

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter39: Information Flow And The Neuron

Section: Chapter Questions

Problem 5TYK: The major role of the Na+/K+ pump is to: a. cause a rapid firing of the action potential so the...

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The major role of the Na+/K+ pump is to: a. cause a rapid firing of the action potential so the inside of themembrane becomes momentarily positive. b. decrease the resting membrane potential to zero. c. hyperpolarize the membrane above resting value. d. cause an action potential to enter a refractory period. e. maintain the resting membrane potential at a constantnegative value.
Suppose that gated ion channels for Na+or Ca2+ opened in the plasma membrane of a muscle cell.The membrane potential of that cell would a. move toward the equilibrium potential for that ion. b. become less negative than the resting membrane potential. c. move farther away from the potassium equilibrium potential. d. all of these.
The resting membrane potential of a neuron or muscle cell is a. equal to the potassium equilibrium potential. b. equal to the sodium equilibrium potential. c. somewhat less negative than the potassium equilibrium potential. d. somewhat more positive than the sodium equilibrium potential. e. not changed by stimulation.
What happens when a resting neuron’s membranedepolarizes?(A) There is a net diffusion of Na+out of the cell.(B) The equilibrium potential for K+(EK) becomesmore positive.(C) The neuron’s membrane voltage becomesmore positive.(D) The cell’s inside is more negative than the outside
At the membrane of an axón, the action potential is -60 mV for K+ ions. Calculate de external and internal concentration radios.
Assume a neuron's membrane potential is -60 mV, what's the net consequence on the membrane potential of a 5 picoamp (pA) sodium current that occurs simultaneously with a 5 pA chloride current? a. There's a 5 pA hyperpolarizing current b. There's a 10 pA depolarizing current c. There's a 10 pA hyperpolarizing current d. There's a 5 pA depolarizing current e. There's no change in the membrane potential
Nerve membrane hyperpolarization after an action potential a)Is the movement of membrane potential voltage below normal resting potential voltage. b) This Is mostly due to the slow-closing of K+ channels. c)Makes it more difficult to evoke another action potential. d) This Is mostly due to the slow-closing of Na+ channels.
The differences in relative concentrations of ions inside and outside the cell act as an electrical force. The specific ion(s) MOST important to establishing the resting potential in neurons would be Multiple Choice a) Na+. b) K+. c) intracellular anions (e.g., proteins). d) H+. e) Na+, K+, and intracellular anions are all important.
3. Suppose you discover a chemical that can block leak potassium channels. What might happen as a result of this blockage? A) Na might have a larger influence on resting potential B) All of the answers are correct C) The Na/K pump activity might slow D) K would become less permeable
What ion/s is/are most likely to have a high conductance through the Jerrionin channel?
What happens to the resting membrane potential if the extracellular K' concentration is increased. Select one: The resting membrane potential will become less negative. The resting membrane potential will not change. The resting membrane potential will become more negative.
The resting membrane potential…A) Can be approximated using the Nernst equation.B) Is established by a difference in charges across the cell membrane, with the inside more positive than the outside.C) Has no influence on the driving force for flow of a particular ion across the cell membrane.D) Is more dependent on the passive flow of potassium vs. sodium ions through leak channels across the cell membrane.E) Stays the same during an action potential.