Selective Permeability

Real World Example

Imagine trying to control who enters your exclusive party by using a guest list. Just as you only allow certain people who are on the list to enter the party, a cell membrane selectively allows certain substances to pass through while blocking others. In this analogy, the party is like the inside of the cell, the guest list is similar to the selective permeability of the cell membrane, and the guests who are allowed in represent the specific molecules that can enter the cell.