In a voltage clamp: O A. A constant current across the membrane is maintained in order to counter balance changes in membrane potential. O B. A variable voltage is applied across the membrane in order to maintain a constant membrane potential O C.A variable current is applied across the cell membrane in response to changes in the ion concentration outside the cell. O D.Changes in current applied to a membrane in order to maintain a constant voltage represent the flow of ions through channels in the membrane O E. both A. and C. O F. Both B. and D.

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Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.