Flashcards in Cellular Transport Deck (21):
The dissolution or destruction of a cell.
Shrinkage or contraction of the protoplasm away from the wall of a living plant or bacterial cell, caused by loss of water through osmosis.
The pressure exerted on a plant cell wall by water passing into the cell by osmosis. Also called hydrostatic pressure
Diffusion of fluid through a semipermeable membrane from a solution with a low solute concentration to a solution with a higher solute concentration until there is an equal concentration of fluid on both sides of the membrane.
Introduction of fluids into a cell by invagination of the cell membrane, followed by formation of vesicles within the cells.
A process of cellular ingestion by which the plasma membrane folds inward to bring substances into the cell.
A process of cellular secretion or excretion in which substances contained in vesicles are discharged from the cell by fusion of the vesicular membrane with the outer cell membrane.
A protein that transports specific substance through intracellular compartments, into the extracellular fluid, or across the cell membrane.
The movement of a chemical substance across a cell membrane without expenditure of energy by the cell, as in diffusion.
diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal
Transport of substances across a biological membrane from an area of higher concentration to an area of lower concentration by means of a carrier molecule. Since the substances move along the direction of their concentration gradients, energy is not required.
pore-forming membrane proteins whose functions include establishing a resting membrane potential, shaping action potentials and other electrical signals by gating the flow of ions across the cell membrane, controlling the flow of ions across secretory and epithelial cells, and regulating cell volume.
a gradual change in the concentration of solutes in a solution as a function of distance through a solution.
Having a higher osmotic pressure in a fluid relative to another fluid.
having a lesser osmotic pressure in a fluid compared to another fluid
The condition in which all acting influences are balanced or canceled by equal opposing forces.
Having equal tension.
a specialized vacuole of eukaryote cells, especially protozoa, that fills with water from the cytoplasm and then discharges this externally by the opening of a permanent narrow passage.
A cell that engulfs and digests debris and invading microorganisms
A kind of transport wherein ions or molecules move against a concentration gradient, which means movement in the direction opposite that of diffusion – or – movement from an area of lower concentration to an area of higher concentration. Hence, this process will require expenditure of energy, and the assistance of a type of protein called a carrier protein.