The Cell in its Environment Chapter 1, Section 4 p. 32-37

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

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

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

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

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

Active and Passive Transportation See image below (10)