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Diffusion/Osmosis/Transport Moving through the cell membrane Exchange of materials between a cell and its environment takes place at the cell membrane The cell membrane controls what goes into and out of the cell CELL MEMBRANE MADE OF PHOSPHOLIPIDS (PHOSPHATE + FAT) SMALL PARTICLES LIKE WATER AND OXYGEN CAN DIFFUSE THROUGH EASILY BECAUSE OF SMALL SIZE LARGER MOLECULES MUST TRAVEL THROUGH “PROTEIN DOORWAYS” IN ORDER TO LEAVE OR ENTER THE CELL PASSIVE TRANSPORT DIFFUSION( MOVEMENT) OF PARTICLES THROUGH PROTEIN DOORWAYS PARTICLES MOVE FROM AN AREA OF HIGH CONCENTRATION TO AN AREA OF LOW CONCENTRATION NO ENERGY IS REQUIRED ACTIVE TRANSPORT MOVEMENT OF PARTICLES THROUGH PROTEINS AGAINST THE NORMAL DIRECTION OF DIFFUSION PARTICLES MOVE FROM LOW TO HIGH AREA OF CONCENTRATION ENERGY IS NEEDED FOR THIS– IT COMES FROM THE MOLECULE ATP( STORES ENERGY IN A FORM THAT CELLS CAN USE) DIFFUSION PARTICLES NORMALLY TRAVEL FROM AREAS WHERE THEY ARE CROWDED TO WHERE THEY ARE LESS CROWDED DIFFUSION IS MOVEMENT OF PARTICLES FROM HIGH TO LOW CONCENTRATION HAPPENS ACROSS CELL MEMBRANES OR OUTSIDE OF CELLS NO ENERGY IS NEEDED FOR DIFFUSION TO OCCUR Question????? What happens to a red blood cell when it is put into a salty solution? What happens when a wilted plant is watered? OSMOSIS THE CELLS OF LIVING ORGANISMS ARE SURROUNDED BY AND FILLED WITH FLUID MADE MOSTLY OF WATER THE DIFFUSION OF WATER THROUGH THE CELL MEMBRANE IS OSMOSIS WATER MOVES FROM AREAS OF HIGH TO LOW CONCENTRATION OSMOSIS TAKES PLACE IN DIFFERENT DIRECTIONS DEPENDING ON THE CONCENTRATION OF WATER SURROUNDING THE CELL MOVING LARGE PARTICLES ENDOCYTOSIS ( INSIDE CELL ) THE CELL MEMBRANE SURROUNDS A PARTICLE AND ENCLOSES IT IN A VESICLE EXOCYTOSIS ( OUTSIDE CELL) VESICLES FORMED AT THE ER OR GOLGI COMPLEX CARRY PARTICLES TO THE CELL MEMBRANE Photosynthesis – process in which autotrophs use light energy from the sun to produce food. CELL ENERGY PHOTOSYNTHESIS: LIGHT ENERGY, CARBON DIOXIDE AND WATER ARE USED TO MAKE FOOD(GLUCOSE). OXYGEN IS RELEASED 6CO2 +6H2O+light energy C6H12O6 + 6O2 CELLULAR RESPIRATION IN EUKARYOTIC CELLS THIS TAKES PLACE AT THE MITOCHONDRIA. FOOD(GLUCOSE) IS BROKEN DOWN INTO CARBON DIOXIDE AND WATER AND ENERGY IS RELEASED C6H12O6 +6O2 6CO2 +6H2O + ATP(ENERGY) Respiration occurs in the mitochondria WHAT IS FERMENTATION? Fermentation is the creation of energy without using oxygen Example: marathon running… lactic acid and yeast cells