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19 Cards in this Set

  • Front
  • Back
Selective/Differential permeability
Valuable cell proteins and other substances are kept within the cell and all waste passes to the exterior.
Passive Processes
Concentration or pressure differences drive the movement.
Active Processes
The cell provides energy (ATP) to power the transport process.
Brownian Movement
The random motion of small particles.
Concentration Gradient
Difference in concentration.
Movement of molecules from a region of higher concentration to one of lower concentration.
Simple Diffusion
The diffusion of solutes through a differentially permeable membrane.
The diffusion of water through a differentially permeable membrane.
Facilitated Diffusion
Certain molecules combine with protein carrier molecules in the plasma membrane and move from one side of the membrane to the other down a concentration gradient. Does not require ATP.
The crinkling-up process cells undergo when the solution is hypertonic to the cell.
Contains more nonpenetrating solutes than are present in the cell.
The cell contains more solutes than are present in the outside of the cell.
The bursting of red blood cells when too much water enters them.
What are the two types of active processes?
Active transport and vesicular transport
solute pumps
Moves substances against the concentration gradient.
What are the two types of vesicular transport?
Endocytosis and exocytosis.
AKA fluid-phase endocytosis, the cell membranr sinks beneath the material to form a small vesicle, which then pinches off into the cell interior. Most common for taking liquids containing protein or fat.
Parts of the plasma membrane expand and flow around a large or solid material. The membranous sac forms (phagosome) and is fused with a lysosome, where the contents are digested.
Receptor-mediated endocytosis
Used primarily for specific molecules such as cholestorol, iron, and some hormones, and for transfer of substances from one side of the cell to another.