1. The Cell in its Environment
Chapter 1, Section 4 p

2. Passive Transport
The movement of dissolved materials through a cell membrane without using cellular energy
Osmosis
Diffusion

3. Diffusion process by which molecules move from an area of higher concentration to an area of lower concentration

4. Diffusion continued… What causes Diffusion? Diffusion of Oxygen
More molecules = more collisions
Eventually, molecules will be evenly spread out
Diffusion of Oxygen
Cell membrane is permeable to oxygen molecules, same as regular diffusion

5. Osmosis diffusion of water molecules through a selectively permeable membrane
See Image below (9)

6. Active Transport Requires the cell to use its own energy
Transport Proteins- pick up molecules outside the cell and carry them in, and also carry stuff out of cell
Engulfing- surrounds membrane and encloses around a particle and kind of absorbs it

7. Active and Passive Transportation
See image below (10)