Under some conditions, the result of the movement of a dissolved substance across a cells membrane is

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Under some conditions, the result of the movement of a dissolved substance across a cell’s membrane is described by the equationimage


In this equation, y is the concentration of the substance inside the cell and dy/dt is the rate at which y changes over time. The letters k, A, V, and c stand for constants, k being the permeability coefficient (a property of the membrane), A the surface area of the membrane, V the cell’s volume, and c the concentration of the substance outside the cell. The equation says that the rate at which the concentration changes within the cell is proportional to the difference between it and the outside concentration.


a. Solve the equation for y(t), using y0 to denote y(0).


b. Find the steady-state concentration, limt→∞ y(t).

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Thomas Calculus Early Transcendentals

ISBN: 9780321884077

13th Edition

Authors: Joel R Hass, Christopher E Heil, Maurice D Weir

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