Question 24 The electrochemical gradient that determines how a charged ion will move through a permeable membrane depends upon the electrical forces acting on that ion the difference in concentration of that ion on either side of the membrane the ratio between the charge on the ion and its atomic mass the combined effects of electrical forces and concentration differences across the membrane All of the choices for this question are correct Question 25 Increasing the flow of Na+ ions into a neuron at rest (-70 mV initially) would trigger: depolarization hyperpolarization repolarization no change
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The concentration gradient is the difference in concentration of an ion on either side of the membrane, while the electrical gradient is the difference in charge across the membrane. Second, the ratio between the charge on the ion and its atomic mass can affect Show more…
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For a neuron at rest with a membrane potential of -65 mV, an increase in permeability of the neuron membrane to chloride ions would result in the ________. Group of answer choices: a) depolarization of the neuron b) hyperpolarization of the neuron c) replacement of potassium ions with sodium ions d) replacement of potassium ions with calcium ions
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When a neuron's membrane is at rest, the concentration gradient tends to move sodium ____ the cell and the electrical gradient tends to move it ____ the cell?
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The resting membrane potential in neurons requires: a. membrane transport channels to be constantly open for $\mathrm{Na}^{+}$ and $K^{+}$ flow. b. the inside of neurons to be positive relative to the outside. c. the diffusion of $\mathrm{K}^{+}$ out of the cell and a charge difference between the inside and outside of the axon set up by this movement of $\mathrm{K}^{+}$ d. an active $\mathrm{Na}^{+} / \mathrm{K}^{+}$ pump, which pumps $\mathrm{Na}^{+}$ and $\mathrm{K}^{+}$ into the neuron. e. three $\mathrm{Na}^{+}$ ions to be pumped through three Na $^{+}$ gates and two $\mathrm{K}^{+}$ ions to be pumped through two $\mathrm{K}^{+}$ gates.
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