4/19/10

MOVEMENT OF SUBSTANCES ACROSS THE CELL MEMBRANE

Movement through the cell membrane occurs in essentially two ways: passively, without an expenditure of energy, or actively, using energy-consuming processes. The cell membrane can also engulf a particle, forming a membrane-coated vesicle; this membrane-coated vesicle is moved into the cell by endocytosis or out of the cell by exocytosis.

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