diffusion
the movement of particles from a region of high to low concentration.
passive transport
the movement of particles WITHOUT the need of energy.
osmosis
the movement of water across a membrane, needs NO energy
facilitated diffusion
the movement of molecules across a membrane with the help of PROTEINS, needs NO ENERGY.
active transport
the movement of particles against its concentration gradient, REQUIRES ATP (energy)
Cell Membrane or Plasma membrane
Organelle that surrounds the cell and controls what goes in and out.
Homeostasis
Maintaining balance or equalibrium inside the cell.
Semipermeable, selectively permeable
Only certain molecules can cross.
phagocytosis
A type of endocytosis in which a cell engulfs large particles or whole cells Requires ATP
pinocytosis
A type of endocytosis in which the cell ingests extracellular fluid and its dissolved solutes. Requires ATP
endocytosis
process by which a cell takes in a substance by surrounding it with the cell membrane, requires ATP
exocytosis
release of substances out a cell by the fusion of a vesicle with the membrane, requires ATP
endocytosis, exocytosis, pinocytosis, phagocytosis, pumps
examples of ACTIVE transport, requires energy
diffusion, facilitated diffusion, osmosis
forms of PASSIVE transport, requires NO energy
main purpose of cell membrane
homeostasis
lipids
biomolecule that makes up the majority of the cell mebrane