Cell Transport - Active Transport

Movement of materials through a membrane against a concentration gradient

Movement of substances from areas of low concentration to areas of high concentrations

Requires: ENERGY from the cell (ATP), and a transport protein or channel protein (these are often called pumps)

Transport of ions: Protein pumps move ions across membranes

Example: Sodium-Potassium Pump

Move across the membrane by endocytosis or exocytosis

Cell membrane folds in around a large particle and forms a small pouch

The pouch then "pinches off" from the cell membrane to become a vesicle inside the cell

Phagocytosis: cell eating (engulfs food particles)

Pinocytosis: cell drinking (engulfs fluid)

A vesicle moves to the cell membrane

Fuses with cell membrane, and then releases its contents to the outside of the cell.