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Transcript
Transport of Molecules concentration A B Where is there a higher concentration of yellow dots? DIFFUSION A B Tendency for molecules to move from an area of high concentration to an area of low concentration. Transport of Molecules WHAT IS HAPPENING - EXPLAIN THIS TO THE PERSON SITTING NEXT TO YOU… DIFFUSION Tendency for molecules to move from an area of high concentration to an area of low concentration. DIFFUSION through a semi-permeable membrane membranes act as filters. DIFFUSION through a semi-permeable membrane SOLUTE SOLVENT particle that dissolves substance in which another substance is dissolved DIFFUSION through a semipermeable membrane Tendency for molecules to move from an area of high concentration to a an area of low concentration solution IODINE + STARCH -> PURPLE DIFFUSION through a semipermeable membrane Tendency for molecules to move from hypertonic solution to a hypotonic solution Hypertonic = HIGH solute concentration compared to “X” side Hypotonic = low solute concentration compared to “X” side outside WE HAVE BEEN MOVING SOLUTE MOLECULES….. Moving the SOLVENT What is next? OSMOSIS through a semipermeable membrane Tendency for WATER to move from ??? solution to a ??? solution osmosis Tendency for WATER MOLECULES to move from hypotonic solution to a hypertonic solution DIFFUSION OSMOSIS think of passive transport like going down a slide… think of facilitated diffusion like going down a slide… with help of proteins It just goes! going from HIGH to low requires no energy… Still PASSIVE…. What is different? think of DIFFUSION like going down a slide… Going from HIGH to low requires no energy… What happens in plant cells? OSMOSIS??? What happens in plant cells? Remember, they have a CELL WALL What happens in plant cells? the pressure of the cell contents against the cell wall, in plant cells, determined by the water content of the vacuole What happens in plant cells? the pressure of the cell contents against the cell wall, in plant cells, determined by the water content of the Osmosis in cells w/ walls Isotonic is not good enough! TURGID vs. FLACID with salt CELL CELL MEMBRAN WALL E w/ distilled H2O CELL MEMBRAN E ISOTONIC Red Blood Cells pertonic inside the cell HY potonic inside the cell HY Are these words dealing with the CELL…. Or the SOLUTION outside the cell? NOT PASSIVE!! Endocytosis Endocytosis {Endo (within) cytosis (cell) } is a process in which a substance gains entry into a cell without passing through the cell membrane. This process is subdivided into three different types: Active Transport = [low] to [high] ATP think of active transport like going up a slide… think of active transport like going up a slide… going from low to HIGH requires a lot of energy… think of active transport like going up a slide… going from low to HIGH requires a lot of energy… phagocytosis Phagocytosiscell eating pinocytosiscell drinking exocytosiscell vomiting