Cell Transport, Cell transport

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