70 likes | 77 Views
CELL TRANSPORT CONT. pp. 97-102. Passive transport : Movement across the cell membrane without energy. Osmosis : special diffusion of water ( polar ) across membrane. A solution is made of a solute dissolved in a solvent (like water).
E N D
CELL TRANSPORT CONT pp. 97-102
Passive transport: Movement across the cell membrane without energy
Osmosis: special diffusion of water (polar) across membrane • A solution is made of a solute dissolved in a solvent (like water). • Direction of movement is dependent on solutes outside cell. • Water moves towards the greatest number of solutes or towards the highest concentration
Hypertonic: CONC of solutes is higher outside the cell and water moves out the cell- cell shrinks
Hypotonic: CONC of solutes is lower outside the cell and water moves into the cell cell swells
Isotonic:CONC of solutes inside = outside; so no net water movement
Facilitated Diffusion: molecules too big to move across the membrane use carrier proteins EX. Glucose