Question

The nerve cells in your body must constantly remove substances from the cell against the concentration gradient. What type of process most likely takes place to remove substances from a cell against the concentration gradient? Explain.

Answer 1

This is energetically unfavourable. Thermodynamics states that objects really want to diffuse down their concentration gradient - and pushing them back the other way, like in the question, requires energy.

There is only one kind of transport that actively requires energy...