The endoplasmic reticulum (ER) plays a major role in the biosynthesis of proteins. Proteins that are synthesized by ribosomes on the ER are transported into the Golgi apparatus for processing. Some of these proteins will be secreted from the cell, others will be inserted into the plasma membrane, and still others will be inserted into lysosomes.
This is a Cell Transport Flow Chart. Materials that move through the cell can use active or passive transport. Passive Transport doesn't use energy such as in osmosis and simple diffusion. Materials go from areas of high concentration to areas of low concentration. Active transport uses energy and goes from low concentrations to high against the gradient. -Enjoy! Science from Murf LLC