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cell transport

as part of 91156 Cell Biology Level 2 NCEA

TermDefinition
ATP The form of energy used by all living things.
cell The basic unit of life and the building block of all living things.
membrane A semi-permeable phospholipid bilayer forming the boundary of all cells and organelles, controlling the entry and exit of substances.
Diffusion Passive net movement of particles down their concentration gradient, from an area of higher concentration to an area of lower concentration.
Facilitated Diffusion Passive net movement of particles down their concentration gradient, from an area of higher concentration to an area of lower concentration, facilitated by specific proteins in the membrane.
Osmosis Passive net movement of WATER through a semipermeable membrane from an area of higher concentration to an area of lower concentration, until equilibrium is reached.
Hypertonic The solution has a higher solute concentration and lower water concentration compared with inside the cell. Water will move in
Hypotonic The solution has a lower solute concentration and higher water concentration compared with inside the cell. (Hypo is low) Water will move out
Isotonic The solution has a equal solute concentration and equal water concentration as inside the cell. No net water movement
Active transport Where ATP energy is used to move a substance against a concentration gradient, from lower concentration through a transport protein to higher concentration.
Concentration Gradient The difference in the concentration of a substance between two areas.
Passive No energy is used in the process
Active ATP energy is used in the process
Plasmolysis Irreverisble: the membrane shrinks away from the cell wall, the vacuole collapses, and the cell becomes flaccid.
Turgid High water pressure causes the plant cell to be swollen and plant upright
Cytosis Cytosis is a form of active transport that involves the folding (in or out) of the plasma membrane.
Endocytosis infolding membrane/ bulk transport into cell
Exocytosis outfolding/bulk transport out of cell
Created by: NZARoberts
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