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CHAPTER 4 – The Cell In Action Section 1: Exchange with the Environment TRANSPORT ACROSS THE CELL MEMBRANE — “LIPID BILAYER” “FLUID MOSAIC MODEL” PASSIVE TRANSPORT TAKING THE EASY ROAD PASSIVE = REQUIRES NO ENERGY PASSIVE TRANSPORT = DIFFUSION DIFFUSION . . . DIFUSION = OSMOSIS --WATER !!! OSMOSIS . . . 1) Hypertonic --- salt solution = shrink & shrivel 2) Isotonic --- tap water = normal cell 3) Hypotonic --- distilled water = swell & burst “FACILITATED” DIFFUSION carrier proteins are specific for the substances they transport ACTIVE TRANSPORT = USES ENERGY ACTIVE TRANSPORT . . . time to eat & drink — a cell engulfing a substance is an example of active transport phagocytosis & pinocytosis http://www.biology4kids.com/file s/cell2_mitosis.html