1. Active and Passive Transport
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2. 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.

3. Active and Passive Transport
Low concentration 
High concentration 

4. 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

5. Active and Passive Transport
Low concentration 
High concentration 

6. 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.

7. 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