The contractions of the heart are controlled by electrical phenomena, as are nerve impulses throughout thebody. The pulses of electricity that cause the heart to beat result from a remarkable combination ofelectrochemistry and the properties of semipermeable membranes.Cell walls are membranes with variable permeability with respect to number of physiologically important ions.Especially Na+, K+ and Ca²+. The concentrations of these ions are different for the fluids inside the cells(intracellular fluid, ICF) and outside the cells (extracellular fluid, ECF). Changes in the relative concentration ofthe ions in the ECF and ICF lead to changes in the emf of the voltaic cell.For example, in cardiac muscle cells, the concentration of K* in the ICF and ECF are typically about 135mM, and4mM, respectively. [K*]₁cf = 135mM, [K*]µ£cf = 4mM.Can you calculate a potential difference which results in the concentration of K+ ions between ICF and ECFusing the Nernst equation at the physiological temperature of 37°C in mV for moving K* from ECF to ICF?

Answered: Image /qna-images/answer/dbea9220-dc59-4a25-9926-5899a6ace78d.jpg

For example, in cardiac muscle cells, the concentration of K* in the ICF and ECF are typically about 135mM, and 4mM, respectively. [K*]ICF = 135mM, [K*]ECF = 4MM. Can you calculate a potential difference which results in the concentration of K+ ions between ICF and ECF

For example, in cardiac muscle cells, the concentration of K* in the ICF and ECF are typically about 135mM, and 4mM, respectively. [K]ICF = 135mM, [K]ECF = 4MM. Can you calculate a potential difference which results in the concentration of K+ ions between ICF and ECF

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter16: Solubility And Precipitation Equilibria

Section: Chapter Questions

Problem 70AP

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Question

The contractions of the heart are controlled by electrical phenomena, as are nerve impulses throughout the
body. The pulses of electricity that cause the heart to beat result from a remarkable combination of
electrochemistry and the properties of semipermeable membranes.
Cell walls are membranes with variable permeability with respect to number of physiologically important ions.
Especially Na+, K+ and Ca²+. The concentrations of these ions are different for the fluids inside the cells
(intracellular fluid, ICF) and outside the cells (extracellular fluid, ECF). Changes in the relative concentration of
the ions in the ECF and ICF lead to changes in the emf of the voltaic cell.
For example, in cardiac muscle cells, the concentration of K* in the ICF and ECF are typically about 135mM, and
4mM, respectively. [K*]₁cf = 135mM, [K*]µ£cf = 4mM.
Can you calculate a potential difference which results in the concentration of K+ ions between ICF and ECF
using the Nernst equation at the physiological temperature of 37°C in mV for moving K* from ECF to ICF?

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