Welcome to an Amoeba Sisters Short about passive and active transport. Passive transport includes diffusion and osmosis. It doesn’t require added energy – so no ATP required. Substances move with their gradient which means a net movement from a high to low concentration. So, if the high concentration of a substance is outside of the cell, the net movement of the substance will be in. If the high concentration of a substance is inside the cell, the net movement will be out. Some substances need to go through a protein to get through –facilitated diffusion - but since this goes with the gradient and doesn’t require ATP – it’s still passive transport. Active transport uses ATP to move substances against their gradient. For example, this cell could use active transport to help move glucose from a low concentration to high concentration, which is against the gradient. Bulk transport is also active transport. . Bulk transport includes endocytosis – which can bring large particles in – and exocytosis – which can take them out.