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Transcript
Cellular Transport Endocytosis Exocytosis LS.3 http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/E/Endocytosis.html • Endocytosis • In endocytosis, the cell engulfs some of its extracellular fluid (ECF) including material dissolved or suspended in it. A portion of the plasma membrane is invaginated and pinched off forming a membrane-bounded vesicle called an endosome. • Endocytosis removes portions of the plasma membrane and takes them inside the cell. To keep in balance, membrane must be returned to the plasma membrane. This occurs by exocytosis. • Exocytosis Exocytosis is the reverse of endocytosis. • And that is just as well. In 30 minutes an active cell like a macrophage (right) can endocytose an amount of plasma membrane equal to its complete plasma membrane. • This electron micrograph (courtesy of Dr. Robert J. North) shows a guinea phagocyte ingesting polystyrene beads. Several beads are already enclosed in vacuoles while the others are in the process of being engulfed. • So the cell must have a mechanism to restore the normal amount of plasma membrane. Exocytosis is that mechanism. More Resources • • • • • http://academic.brooklyn.cuny.edu/biology/bio4fv/page/endocyta.htm (endocytosis and exocytosis) http://personal.tmlp.com/Jimr57/textbook/chapter3/cmf4a.htm The Virtual Cell Web Page (endocytosis and exocytosis) http://www.bbc.co.uk/education/asguru/biology/01cellbiology/05pathways/09endoexo/ index.shtml (endocytosis and exocytosis) http://www.wisc-online.com/objects/index_tj.asp?objID=AP11403 – Typical Animal Cell---Interactive http://www.wiley.com/legacy/college/boyer/0470003790/animations/cell_structure/cell _structure.htm – Cell Structure—Interactive