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Cell Transport Diffusion Process by which molecules tend to move from an area of high concentration to low concentration http://highered.mcgrawhill.com/sites/0072495855/student_vi ew0/chapter2/animation__how_diffus ion_works.html Homeostasis Process by which organisms maintain a relatively stable internal environment Semi-Permeable Membrane The outer layer that allows certain substances to pass into & out of a cell Osmosis Diffusion of water through a selectively permeable membrane http://highered.mcgrawhill.com/sites/0072495855/student_vi ew0/chapter2/animation__how_osmo sis_works.html Isotonic Concentration of particles is the same inside as outside Isotonic Hypertonic Solution outside cell has a higher particle concentration than inside cell Hypertonic Hypotonic Solution outside cell has a lower particle concentration than inside cell Hypotonic http://www.savevid.com/video/eggosmosis-hypertonic-vs-hypotonicsolution.html Animal Cells Plant Cells Active Transport Transport across a membrane that requires energy http://www.dnatube.com/video/1589/Cell ular-transprot-of-sodium-and-potassiumactive-transport Endocytosis Exocytosis molecules moving “into” a cell forming vesicles molecules moving “out of” a cell from vesicles http://highered.mcgrawhill.com/olcweb/cgi/pluginpop.cgi?it=swf:: 535::535::/sites/dl/free/0072437316/1200 68/bio02.swf::Endocytosis%20and%20Exoc ytosis Passive Transport Does NOT require energy to move across a membrane Facilitated Diffusion Movement of molecules across a membrane via protein channels http://www.goldiesroom.org/video_a rchive.htm
