What controls what enters or leaves a cell?

Answer by  Katie57 (169)

Receptors and transporters control what enters and exits a cell. Both the number of receptors and transporters, and their actions, are controlled by proteins produced in the nucleus of the cell.

Answer by  Ranger305 (96)

The plasma membrane of a cell is semipermeable. Meaning that it only lets certain molecules or ions within or out of the cell. The rate of transference is dependent on a number of factors such as pressure or the temperature of the solutes within and around the cell. The membrane is also involved with cell potential.