Vocab Flashcards
Diffusion
the process by which molecules move from an area of greater concentration to an area of lesser concentration
Concentration Gradient
the difference in concentration of a substance across space
Equilibrium
a state that exists when the concentration of a substance is the same throughout a space
Osmosis
the diffusion of water across a selectively permeable membrane
Hypotonic
describing a solution whose solute concentration is lower than that inside a cell
Hypertonic
describing a solution whole solute concentration is higher than that inside a cell
Isotonic
describing a solution whose solute concentration equals that inside a cell
Contractile Vacuole
an organelle in protists that expels water
Turgor Pressure
water pressure within a plant cell
Plasmolysis
the shrinking or wilting of a walled cell in a Hypertonic environment
Cytolysis
the bursting of a cell
Facilitated Diffusion
a process in which substances move down their concentration gradient across the cell membrane with the assistance of carrier proteins
Carrier Proteins
a protein that transports specific substances across a biological membrane
Ion Channels
a membrane protein that provides a passageway across the cell membrane in which an ion can diffuse
Sodium Potassium Pump
a carrier protein that actively
transports K+ ions into and Na+ out of the cell
