Two scientists calculated the membrane potential of a neuron using two different equations, the Nernst equation and the Goldman equation. Their calculations gave them slightly different predictions. What is the most likely reason for this difference? The lipid compositions of the cell membranes that the scientists studied were different. The scientists placed their measuring electrodes in slightly different positions. The temperatures of the fluid surrounding the cell membranes were different. The numbers of ions considered in the calculations were different. The scientists measured different numbers of cells.

Two scientists calculated the membrane potential of a neuron using two different equations, the Nernst equation and the Goldman equation. Their calculations gave them slightly different predictions. What is the most likely reason for this difference? The lipid compositions of the cell membranes that the scientists studied were different. The scientists placed their measuring electrodes in slightly different positions. The temperatures of the fluid surrounding the cell membranes were different. The numbers of ions considered in the calculations were different. The scientists measured different numbers of cells.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter3: The Plasma Membrane And Membrane Potential

Section: Chapter Questions

Problem 2TAHL: Assume that a membrane permeable to Na+ but not to Cl- separates two solutions. The concentration of...

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Your friend has made an artificial membrane to study ion concentration gradients in a laboratory and is confused after observing the ion concentration gradient in the image below. Initially (Time 1) there was a very strong concentration gradient across the membrane and your friend expected that ions would move until the concentrations were equal across the membrane. For a short time there was movement of ions but this soon stopped and there is no further change in the situation no matter how long you wait (see Time 2). Time 1 You friend is confused because there is still a strong concentration gradient and there are open ion channels available. So why don't the concentrations equalise? After thinking about it you realise that there must be some information that is incorrect or missing from the diagram above. Select the image below that explains why the ion concentrations remain unequal across the membrane Time 2 Select the correct image by clicking on it (you can only select one…
What is the free energy change for the transport of calcium ions (Ca++) across a membrane from a region (left) where the concentration is 50 micromolar to a region (right) where the concentration is 50 micromolar? A membrane potential of 60 mV exists across the membrane where the right side is more negative than the left side. The temperature is 25 C.
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Chloride ions (Cl-) are in higher concentration outside of the cell compared to the intracellular fluid (ICF). If a cell is at rest and chloride-specific ion channels open, identify what would happen. Choose ALL of the correct answers. 1 Some chloride will enter the cell, but the concentration gradient for chloride will not change much. 2 The membrane will hyperpolarize 3 Chloride will come into the cell until it reaches chemical equilibrium. 4 The membrane potential won't change. 5 The membrane will depolarize 6 Some chloride will leave the cell, but the concentration gradient for chloride will not change much
The membrane of most cells, including neurons, contains passive, open, K' leak channels. Given the normal K' concentrations and the resultant concentration gradient, which direction would K' be expected to move (diffuse) through these leak channels? Select one: 1/into the cell 2/out of the cell
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In the figure below are several panels that illustrate the relative concentration of a particular solute on either side of a cell's plasma membrane. The top panel represents the INITIAL (or starting) scenario, and the lower panels represent different possible outcomes after time has passed. QUESTION: Which of the panels below represents a situation in which the concentration gradient of this solute has been minimized (reduced)? A B C D
The resting membrane potential…A) Can be approximated using the Goldman-Hodgkin-Katz equation.B) Represents a difference in charges across the cell membrane, resulting mostly from the passive flow of Na+ions.C) Has no influence on the driving force that acts on different ions across the cell membrane.D) Is equally dependent on the concentration gradients of potassium and sodium across the cell membrane.E) Becomes hyperpolarized during an excitatory graded potential.
The resting membrane potential is established by? The Na+/K+-ATPase pumping Na+ into the cell and K+ out of the cell The Na+/K+-ATPase pumping K+ into the cell and Na+ out of the cell A larger diffusion of K+ out of the cell compared to diffusion of Na+ into the cell A larger diffusion of K+ into the cell compared to diffusion of Na+ out of the cell a) and d) b) and c)
Assume that a membrane permeable to Na+ but not to Cl- separates two solutions. The concentration of sodium chloride on side 1 is higher than on side 2. Which of the following ionic movements would occur? a. Na+ would move until its concentration gradient is dissipated (until the concentration of Na+ on side 2 is the same as the concentration of Na+ on side 1). b. Cl- would move down its concentration gradient from side 1 to side 2. c. A membrane potential, negative on side 1, would develop. d. A membrane potential, positive on side 1, would develop. e. None of the preceding is correct.
In the experimental setup described in the attached figure (Figure 2.5 of the textbook), the middle panel shows two compartments with 10 mM KCI on the left (inside) and 1 mM KCL on the right (outside), separated by a membrane that is permeable to K+. What would initially happen if you replaced the KCI solutions with NaCl solutions (1 mM on the left or inside and 10 mM on the right or outside)? (A) Inside 1 mM KC Voltmeter Outside 1 mM KCI Permeable to K Nonet Bux of K (B) Initial conditions Initially Inside Outside 10 mM KC 1 mM KC Net flux of K from inside in outside → At equilibrium --58 mY Inside Outside 10 mM KCI 1 mM KC Flux of K from inside to outside balanced by opposing membrare potential Membrane potential (A) -116 [KL] 4 tended change O Na+ would move up its concentration gradient from the left (inside) to the right (outside) compartment. O Na+ would move down its concentration gradient from the right (outside) to the left (inside) compartment. O Na+ would not move because…
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