uses ATP to Move solutes Across a membrane. requires carrier proteins.
two substances are moved across a membrane in the same direction (active transport)
two substances are moved across a membrane in opposite directions (active transport)
primary active transport
hydrolysis of ATP phosphorylates the transport protein causing conformational change.
secondary active transport
use of an exchange pump (such as the na+-k+ pump) indirectly to drive the transport of other solutes
transport of large particles and macromolecules across plasma membranes
moves substance from the cell interior to the extra cellular space
enables large particles and macromolecules to enter the cell.
moving substances into, across, and then out of the cell
moving substances from one area in the cell to another
pseudopods engulf solids and bring them in the cells interior.
the plasma membrane infolds, bringing extracellular fluid and solutes into the interior of the cell
clathrin-coated pits provide the main route for endocytosis and transcytosis
caveolae that are platforms for a variety of signaling molecules.
uses kinetic energy, (ex.movement of o2 through membrane)
uses kinetic energy; movement of glucose into the cells
uses kinetic energy;movement of h2o into and out of the cells
Hydrostatic pressure (formation of kidney filtrate)
active transport of solutes
uses ATP; movement of ions across membranes