tres Flashcards
Substances moving across the selectively permeable plasma membrane can be
either be:
passive or active
Ions such as ____ and ____ must have a special means of penetrating plasma membranes.
Sodium and potassium
use no energy to move molecules
Passive
requires energy to move molecules
Active
two types of
transport mechanisms
passive
active transport.
does not require to expend energy to
occur
passive transport
needs to use energy in the cell.
Active transport
is the movement of particles from an area of higher concentration to an area of low concentration
Diffusion
movement of particles from high to low concentration without a protein
Simple diffusion
passive-mediated transport
utilizes transporters or carriers
to facilitate the movement of larger molecules.
Facilitated Diffusion
is the diffusion of water across the cell membrane
Osmosis
the movement of water from an area with low solute concentration to a high solute concentration.
Osmosis
a substance that is dissolved in a solution
Solute
a substance that has the ability to dissolve a given
solute to form a solution.
Solvent
solute + solvent =
solution
