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Cell material move

QuestionAnswer
Selectively permeable membrane Only selected materials are capable of getting into and out of cells *Plasma membrane
Diffusion Movement of molecules from a high area of concentration to a low area of concentration.
Brownian movement The random Collision of diffusing molecules
Osmosis
Hypotonic solution (pure distilled water) Solution where the salt concentration inside a cell is higher than it is outside the cell. * the cell would absorb water*
Hypertonic solution (a 5% salts solution) Solution where the salt concentration is greater outside the cell than it is inside the cell. * the cell will lose water*
Active transport * Main mechanism by which most cells obtain the material they need for normal functioning* Transportation of materials against factors that will normally keep the material from entering the cell * requires energy in the form ATP*
pH The negative logarithm of the hydrogen ion concentration in a solution pH=-log [H+]
Acid Dissociates and forms excess H+ ions when dissolved in water *pH below 7
Isotonic solution (normal saline) Solution where the salt concentration outside the cell is the same as that inside the cell
Base Substance that combines with H+ ions when dissolved in water *pH above 7
Buffers *Donating H ions when concentration falls. *Taking H ions when concentration rises. Help maintain homeostasis within cells in regard to pH levels, keeping them fairly close to 7.
Example of diffusion The uptake of oxygen by the blood in the lungs and the release of carbon dioxide to the lungs from the blood
Neutral pH=7 Distilled pure water
Created by: Evelyn Brown