Chloride (CI), a negatively-charged ion, is in equilibrium with regards to its f

Question

Chloride (CI), a negatively-charged ion, is in equilibrium with regards to its flux across a membrane at a potential of -70 mV (inside of membrane negative relative to outside). (Elsewise stated, Ec -70 mV. Describe the forces (in terms of both direction and magnitude) acting on chloride across the resting membrane. If the normally low permeability to chloride is suddenly increased, what will happen in terms of chloride flow across the membrane? a. b. An experimenter alters the voltage across the membrane by passing current to make the inside -40 mV relative to the outside, and then treats the membrane in a way that briefly makes it very permeable to Cl. What are the forces (both direction and magnitude) acting on chloride? Will chloride flow cause the voltage to change (from -40 mV), and if so, in which direction? Explain In an experiment similar to part c, current is passed which hyperpolarizes the membrane to -100 mV before it is made permeable to chloride. Answer the same questions as in c for this new experiment c.

Explanation / Answer

a. Concentration gradient provide force to drive ions through the channels.If normally low permeability of chloride ion is suddenly increased, neuron would decresed the resting membrane potential.This action known as hyperpolarization.

b.As the chloride ion is a negativly charged ion. it will make cell in more negative. yes chloride can cause the voltage change.

c.Insufficient information provided.

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