2d) Movement of substances into and out of cells

Cell membranes:

• particles flow through the cell membrane from higher concentration to a lower concentration
• there is an overall net movement 
• substances move in and out by diffusion, osmosis and active transport 

Diffusion is the movement of particles (net) from a high concentration to a low concentration

Osmosis is the net movement of water molecules through a partially permeable membrane from a region of higher water conc. to a region of lower water conc. 

Active Transport is the movement of particles against a concentration 

 

Turgid is when water enters a plant cell and pushes on the cell causing the cell to swell opposite of flaccid 

things in bold, italics are for Paper Two