Active Transport Differences In passive transport a cell will always move from higher concentration to a lower concentration Active transport can move particles from a region of lower concentration to a region of higher concentration or can select for certain molecules Uphill Energy Active transport requires the cell to use energy. These transport proteins using cell energy can move solutes across a membrane against the concentration gradient. I.e. from a low to high concentration. Active Transport within the cell Movement of larger molecules Larger molecules can be moved by a form of active transport: Endocytosis is the engulfing of a material to move it inside the cell Exocytosis - materials are expelled from the cell or from an organelle, ex Golgi Body Endocytosis A large molecule can enter the cell by becoming enclosed in a part of the cell membrane that folds in to form a sphere. The sphere pinches off resulting in a vacuole and the contents go into the cytoplasm Phagocytosis/ Pinocytosis We will study about 2 types of Endocytosis 1. Phagocytosis - is a type of endocytosis in which large particles move into the cell 2. Pinocytosis - Fluid moves into the cell. Exocytosis In exocytosis, materials are ejected from the cell or organelle. Waste can be excreted by the vacuoles Proteins can be packaged by the Golgi Complex Examples… This is the End… Now this is the end of this lesson. I want you all to practice exocytosis and CRY because you will miss Biology class so much when you go home.