2.12 osmosis, active transport, and diffusion

1. diffusion-molecules moving from a region of high concentration to low concentration. The process is passive because we do not have to add energy. The energy comes from the kinetic energy from the molecules itself.
2. osmosis- Movement of water. Water will move from the dilute solution to the concentrated solution through a membrane.
3. active transport-molecules can be moved from outside the cell to inside the cell where they build up high concentration inside the cell. We have to add energy because thats what makes the process 'active' Molecules are tranported from a low to a high concentrated region. This can also happen in the opposite direction where molecules are transported out of the cell.
4. Three ways throgh which substances move in or out of cells.