Diffusion and Osmosis: Cell Transport - Study Guide PDF
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Korea International School Jeju Campus
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Summary
This document covers the biological processes of diffusion and osmosis, which are vital for cell transport. Included is information on how materials are exchanged across the cell membranes. Students will explore the processes of active and passive transport, and learn about concentration gradients, solutes, and water movement. The document also details the importance of homeostasis.
Full Transcript
HOMEOSTASIS STABILITY – KEEP A CONSTANT INTERNAL STATE IN A CHANGING ENVIRONMENT TO MAINTAIN HOMEOSTASIS, CELLS MUST: - EXCHANGE MATERIALS - ELIMINATE WASTE...
HOMEOSTASIS STABILITY – KEEP A CONSTANT INTERNAL STATE IN A CHANGING ENVIRONMENT TO MAINTAIN HOMEOSTASIS, CELLS MUST: - EXCHANGE MATERIALS - ELIMINATE WASTE - OBTAIN AND USE ENERGY - MAKE NEW CELLS EXCHANGE OF MATERIALS FOR THE CELL CELL MEMBRANES ARE SEMIPERMEABLE – ONLY CERTAIN PARTICLES CAN MOVE IN OR OUT OF CELL (SELECTIVE) 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) Protein channel energ y Concentration Gradient Mole cule s move ra ndomly from high concentration to low concentration. DIFFUSION AND OSMOSIS (PASSIVE TRANSPORT) DIFFUSION OSMOSIS MOVEMENT OFMOLECULESFROM MOVEMENT OFWATER THROUGH A HIGH CONCENTRATION TO LOW SEMIPERMEABLE MEMBRANE FROM CONCENTRATION AREAS OF HIGHER TO LOWER CONCENTRATION IN WHICH DIRECTION WILL THE PARTICLES MOVE OR DIFFUSE? ANSWER: THE PARTICLES DIFFUSE FROM MORE CONCENTRATED TO LESS CONCENTRATED! IN WHICH DIRECTION WILL THE WATER MOVE? (OSMOSIS) ANSWER: THE WATER MOVES FROM LESS CONCENTRATE TO MORE CONCENTRATE! wa te r DIFFUSION AND OSMOSIS CONCENTRATION GRADIENT : UNEVEN DISTRIBUTION OF A SUBSTANCE ACROSS A BORDER SOLUTE:PARTICLES DISSOLVED IN WATER SOLUTION:MIXTURE OF WATER AND SOLUTE ISOTONIC:EQUILIBRIUM, SAME CONCENTRATION IN 2 DIFFERENT AREAS HYPERTONIC: THE AREA WITHHIGHER CONCENTRATIONOF SOLUTE (LESS WATER) HYPOTONIC: THE AREA WITHLOWER CONCENTRATIONOF SOLUTE (MORE WATER) WATER ESSENTIAL FOR CELLS WATER MOVES ACROSS THE CELL MEMBRANE BY OSMOSIS IT DEPENDS ON THE CONCENTRATION OF WATER INSIDE AND OUTSIDE THE CELL
