Ex: The sickening scent of cigarette smoke spreads through the air.
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Facilitated diffusion: a passive movement that does not require energy like ATP or carrier proteins
Ex: sodium ions go through facilitated diffusion
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Active transport: the movement of a chemical substance through a gradient of concentration in the direction opposite to
Ex: Fish gills have cells that remove salt from the body by pumping it into the salt water
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Osmosis: the tendency of a fluid to pass through a semipermeable membrane into a solution where the solvent concentration is higher.
ex: when you put salt on a slug, water diffuses the slug and causes it to shrivel up
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endocytosis: the process in which the cell takes in materials from the outside and fusing them with its plasma membrane
ex: skeletal muscle cells taking in neurotransmitters
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REFERENCES
http://dictionary.reference.com/browse/diffusion
http://answers.yahoo.com/question/index?qid=20080917074441AAXTAsL
http://www.youtube.com/watch?v=STzOiRqzzL4
http://dictionary.reference.com/browse/osmosis
http://www.biology-online.org/dictionary/Endocytosis
http://en.wikipedia.org/wiki/Facilitated_diffusion
http://en.wikipedia.org/wiki/Diffusion
http://www.youtube.com/watch?v=gXJMBgyT_hk
http://www.youtube.com/watch?v=OV4PgZDRTQw
http://www.youtube.com/watch?v=sdiJtDRJQEc
http://www.youtube.com/watch?v=4gLtk8Yc1Zc