Modes of transport Flashcards
endocytosis
bulk movement of large molecules into the cell
exocytosis
bulk movement of large molecules out of the cell
passive
no energy requiredfi
diffusion
net movement of particles from a high concentration to a low concentration, down a concentration gradient
osmosis
net movement of water molecules from a high concentration, through a partially permeable membrane, to a low concentration
facilitated diffusion
net movement of particles from a high concentration to a low concentration, down a concentration gradient, through a protein channel/ carrier
active
requires energy
active transport
net movement of particles from a low concentration, toa high concentration . against the concentration gradient using ATP and a protien pump
SIMPLE DIFFUSION examples
FAT SOLUBLE, SMALL, VITAMINS, NON-CHARGED
CHANNEL MEDIATED FACILITATED DIFFUSION examples
IONS, WATER
CARRIER MEDIATED FACILITATED DIFFUSION examples
POLAR MOLECULES, LARGE, SUGAR, AMINO ACIDS
- LEAK CHANNELS = always open
CHEMICAL/LIGAND GATED CHANNELS
Responds when a chemical such as a NT binds to it
VOLTAGE GATED CHANNELS
Opens in response to a change in membrane potential.
MECHANICAL GATED CHANNELS
Opens in response to physical deformation, e.g.,touch.
OSMOLARITY
The total number of solute particles present in 1L of solution. (e.g., the osmolarity of a solution of NaCl at 300 mmol/L is 600 mmol/L