Lecture 66

Question 1

Nernst potential for an ion = voltage INSIDE the cell at which there is no _____ flux of the ion.

Answer 1

Net flux

Question 2

In biology, “current” describes the net flux of ______ (positive or negative?) ions across a membrane.

Answer 2

Positive

Question 3

Gibbs-Donnan equilibrium states that the majority of the negative charge inside cells comes from ______.

Answer 3

Proteins

Question 4

If the membrane potential is Greater than the Nernst potential, positive ions will move _____, and negative ions will move _____. Vise versa if the membrane potential is Less than the Nernst potential.

Answer 4

Positive ions will move OUT, negative will move IN.

Question 5

For Gibbs-Donnan, the membrane potential will have the same sign as the net charge on the ______ ion.

Answer 5

Impermeant

Question 6

The ratios of concentrations (out:in) of monovalent ions are _____ in Gibbs-Donnan equilibrium, and all permeable ions are at their _____ potential.

Answer 6

Equal

Nernst