This question uses the same experimental setup as in Question 1 and the same modification of the attached figure (Figure 2.5 of your textbook). The modification is that the KCL solutions in the middle panel are replaced with NaCl solutions (1 mM on the left or inside and 10 mM on the right or outside). What would initially happen if the membrane was made permeable to Na+? (A) Lure D A Inside 1 mM KQ Voltmotor V=0 elle Outside 1 mM KCI Termeable to K* No net flux of K* K' lon (B) Initial conditions ● lo 6 Inside 10 πιΜ KCl Initially V=0 очен Outside 1 mM KCI Net flux of K from inside to outside At equilibrium V in-out= -38 my a ✪ m O Inside Outside 10 mM KC 1 mM ka Flux of K* from inside to outside balanced by opposing membning potential Membrane potential V₁ (mv) 8 -116 100 -2 [K' (MM) 10 108 Na+ would move up its concentration gradient from the left (inside) to the right (outside) compartment. Na+ would move down its concentration gradient from the right (outside) to the left (inside) compartment. Na+ would not move because it is at equilibrium. Slope 58 mV per tenfold change in K gradient Na+ would not move because it has a valence (i.e.. charge) of 1+. 0

This question uses the same experimental setup as in Question 1 and the same modification of the attached figure (Figure 2.5 of your textbook). The modification is that the KCL solutions in the middle panel are replaced with NaCl solutions (1 mM on the left or inside and 10 mM on the right or outside). What would initially happen if the membrane was made permeable to Na+? (A) Lure D A Inside 1 mM KQ Voltmotor V=0 elle Outside 1 mM KCI Termeable to K* No net flux of K* K' lon (B) Initial conditions ● lo 6 Inside 10 πιΜ KCl Initially V=0 очен Outside 1 mM KCI Net flux of K from inside to outside At equilibrium V in-out= -38 my a ✪ m O Inside Outside 10 mM KC 1 mM ka Flux of K* from inside to outside balanced by opposing membning potential Membrane potential V₁ (mv) 8 -116 100 -2 [K' (MM) 10 108 Na+ would move up its concentration gradient from the left (inside) to the right (outside) compartment. Na+ would move down its concentration gradient from the right (outside) to the left (inside) compartment. Na+ would not move because it is at equilibrium. Slope 58 mV per tenfold change in K gradient Na+ would not move because it has a valence (i.e.. charge) of 1+. 0

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 2SQE: One of the important uses of the Nernst equation is in describing the flow of ions across plasma...

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