Membrane Potential I Flashcards
What will happen if the membrane is permeable to only one ion and impermeable to the counterion?
an electrical charge is established
How much is one mole?
6.02x10^23
An imbalance in the number of cations and anions inside a cell produces the ____.
membrane potential
What does z stand for in the Nernst Equation?
valence of the ion in question
If an ion is at equal concentrations across a membrane, what will be its equilibrium potential?
zero
The ion concentration difference and the electrical potential difference across the membrane govern ______.
passive movement of an ion across the membrane
If the membrane is ______ to both Na+ and Cl-, nothing will happen and the cell will survive.
impermeable
What does T stand for in the Nernst Equation?
temperature
The passive movement of an ion across the membrane is governed by two forces: _____ and _____.
its concentration difference; the electrical potential difference across the membrane
What does R stand for in the Nernst Equation?
the gas constant
____ charge is much stronger than ____ charge.
Electrical; osmotic
How do animal cells solve the problem of controlling their volume?
by surrounding themselves with an external solution that also contains nonpermeating molecules
What if Vm is not the same as ECl?
either a) the membrane is impermeable to the ion or b) the ion must be pumped across the membrane
If the membrane is impermeable to both Na+ and Cl-, _____ and the cell _____.
nothing will happen; will survive
The electrochemical gradient is made by?
The ion concentration difference and the electrical potential difference across the membrane in a cell
