1. Week 3 Vocab Definitions

2. Osmosis
The passive diffusion of water
Active Transport
Uses energy (ATP) to move molecules "uphill" against a concentration gradient.
Diffusion
The passive movement of particles from high to low concentrations

3. Facilitated Diffusion
Passive diffusion of particles through a transport protein from high to low concentration
Transport Protein
Tube-like opening in the plasma membrane through which particles can diffuse

4. Equilibrium
a state of balance
Concentration Gradient
The difference in concentration of solutes between two areas

5. Selectively permeable
Describes the cell membrane which only lets some things pass through

6. Hypotonic
The amount of solute in the environment is less than inside the cell; causes cell to swell
Hypertonic
The amount of solute in the environment is greater than inside the cell; causes the cell to shrink