Depolarisation & repolarisation in metaneuron - put the following events in order (from 1 to 4).                                                        Membrane potential crosses the threshold potential and an action potential is achieved.                                                        Depolarisation occurs when the applied current is sufficient to move membrane potential towards neutral.                                                        The neuron’s membrane potential drops below the initial resting membrane potential and temporarily becomes refractory to further action potentials.                                                        Membrane quickly repolarises by opening of K+ channels, allowing K+ions to leave the cell and charge separation to be re-established.

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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.