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18 Cards in this Set

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a diffrence in the concentration of a substance across a distance
concentrationgradient
the movement of chemical substances, usually across the cell membrance, against a concentration gradient, requires cell to use energy
active transport
the process by which a cell engulgs large particles or whole cells, either as a defence mechanism or as a means to obtain food
phasocytesis
describes a solution whose solute concentration is lower than the solute concentration inside a cell
hypotonic
a small sac that surrounds the materials to be taken into the cell or transported within the cell
yesicle
a carrier protein that uses atp to actively transport sodium ions out of a cell and potassium ions into the cell
sodium potassim pump
the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins
facilitateddiffusion
describes a solutioin whose solute concentrationi is higher than the solute inside a cell
hypertonic
the diffusion of water from a more dilute solution to a more concentrated solution through a membrane
osmosis
the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell
endocytosis
the movement of particles from regions of higher density to regions of lower density
diffusion
the bursting of a cell
cytolysis
describes a solution whose solute concentratiopn is equal to the solute concentration inside a cell
isotonic
a method of active transport across the cell membrance in which the cell takes in extracellular fluids
pinocytosis
the movement of substances across a cell membrane without the use of energy by the cell
passive transport
the contraction or shrinking of the cell membrane of a plant cell in hypertonic solutioin in response to the loss of water by osmosis
plasmolysis
the proscess by which a substance is released from the cell through a vesicle that fuses with the membrane to let the substance out
exocytosis
in biology, a stat that exists when the concentrationi of a substance is the same throughout a space
equilibrium