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Osmosis

Movement through cell membranes

TermDefinition
Cell membrane structure Semi permeable Made up of a phospholipid bilayer Protein channels
Semi permeable definition Allows some but not all substance to pass through
Function of protein channels in cell membrane Aid transport
Substances that have free movement in cell membrane Water, carbon dioxide and oxygen
3 mechanisms that are responsible for the movement of substances through a cell Diffusion Osmosis Active transport
Diffusion The movement of molecules from an area of high concentration to an area of low concentration
Passive process Does not require energy
Where diffusion takes place Gaseous exchange in the lungs Absorption of water and minerals in intestine and root hairs
Steps of diffusion High concentration of CO2 in the blood diffuses into alveoli to be breathed out. O2 diffuses from high concentration in the alveoli into the blood.
Active transport The movement of substances from an area of low concentration across semi permeable membrane
Active process Requires energy (ATP) to place
Example of active transport Glucose moves from the blood capillaries through the cell membrane by active transport .
Osmosis The movement of water from an area of high concentration to an area of low concentration, across a semipermeable membrane Only refers to water Passive process
Reasons osmosis is a special case of diffusion Movement of only water Must go through a semi permeable membrane Moves across a concentration gradient from high to low Passive process
Turgor The pressure exerted by the cell contents on the cell wall of a plant cell
Opposite of turgid Flaccid
Plasmolysis Loss of water from a plant cell Cell membrane detaches from the cell wall
Created by: EObrienHart
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