Which of the following statements best describes the features of voltage-gated K+ channels?     They consist of 4 subunits, are activated at the same time as voltage-gated Na+ channels, but do not inactivate.     They consist of 4 subunits, are activated by depolarisation and close slowly during the refractory period.     They have 24 membrane spanning alpha helices, 4 of which have positively charged amino acids which promote a conformational change in the channel following depolarisation.     They consist of 4 subunits and are open at rest which causes the resting membrane potential to be close to the K+ equilibrium potential.

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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.