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DIFFUSION AND OSMOSIS

DIFFUSION AND OSMOSIS 7TH GRADE LIFE SCIENCE HOMEOSTASIS S TAB ILITY KEEP A CONSTANT INTERNAL STATE IN A CHANGING ENVIRONMENT TO MAINTAIN HOMEOSTASIS, CELLS MUST: - EXC HANGE MATERIALS - E LIMIN ATE WAS TE - O B TAIN AND USE ENERGY - MAKE NEW CELLS EXCHANGE OF MATERIALS FOR THE CELL CELL MEMBRANES ARE SEMIPERMEABLE O N LY C E R TAIN P AR TIC LE S C AN MO VE IN O R O UT O F C E LL (S E LE C TIVE) PASSIVE TRANSPORT: TRANSPORT OF MATERIALS STRAIGHT through THE CELL membrane (DOES NOT USE ENERGY) ACTIVE TRANSPORT: TRANSPORT OF MATERIALS through PROTEIN CHANNELS IN CELL membrane (REQUIRES ENERGY) energy Protein channel Concentration Gradient Molecules move ra ndomly from high concentration to low concentration.

diffusion • movement of molecules from high concentration to low concentration osmosis • movement of water through a semipermeable membrane from areas of higher to lower concentration . in which direction will the particles move or …

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