Active and Passive Transport Check me out! Another good video!

Active and Passive Transport Passive transport requires no energy from the cell. Examples include the diffusion of oxygen and carbon dioxide and osmosis of water Particles move from areas of high concentration to areas of low concentration. Facilitated diffusion requires assistance, but still moves from high to low areas of concentration, so it still does not take energy.

Active and Passive Transport Low concentration  High concentration 

Active and Passive Transport Active transport requires the cell to spend energy, usually in the form of ATP. Active transport usually involves the movement of particles from an area of low concentration to an area of high concentration. Going against the concentration gradient Opposite of passive transport

Active and Passive Transport Low concentration  High concentration 

Active Transport Large particles move into and out of the cell by processes called endocytosis and exocytosis Endocytosis – the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring it into the cell.

Active Transport Exocytosis – the process by which a cell releases a particle by enclosing the particle in a vesicle that then moves to the cell surface and fuses with the cell membrane. Think, exo = exit