ActiveandPassiveTransport


 * __Diffusion__**- is the process by which molecules move across the cell membrane from an area of higher concentration to an area of lower concentration. For a picture of diffusion you can look in the text book on page 187.

The red dots are the water molecules.
 * __Osmosis__-** is the diffusion of water molecules through a seletively permeable membrane.


 * __Active Transport__**- is an __energy-requiring__ process that lets materials move across a cell membrane from lower concentration to higher concentration. In the text book on page 189 there is a picture of active transport.


 * __Passive Transport__**-is a process that __DOES NOT__ require energy. A molecule moving from a higher concentration to a lower concentration. Diffusion and osmosis are both types of passive transport.

__**Exocytosis**__- when larger molecules are removed from the cell.
 * __Endocytosis__**- is a process of taking in material into the cell by pockets in the cell membrane.