diffusion/osmosis osmosis diffusion intro - youtube osmosis diffusion intro - youtube

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  • Slide 1
  • Diffusion/Osmosis Osmosis Diffusion Intro - YouTube Osmosis Diffusion Intro - YouTube
  • Slide 2
  • Diffusion: Movement of molecules across a cell membraneMovement of molecules across a cell membrane Diffusion requires NO ENERGYDiffusion requires NO ENERGY Molecules move from HIGH to LOW concentration.Molecules move from HIGH to LOW concentration. Lets see!Lets see!Lets see!Lets see! Lets see MORE!Lets see MORE!Lets see MORE!Lets see MORE!
  • Slide 3
  • Slide 4
  • Facilitated Diffusion Many cell membranes have special channels (carrier proteins) that allow molecules to cross it.Many cell membranes have special channels (carrier proteins) that allow molecules to cross it. These channels help or facilitate diffusion to happen.These channels help or facilitate diffusion to happen. This is known as facilitated diffusion.This is known as facilitated diffusion. Like regular diffusion, will ONLY occur if there is a higher concentration of molecules on one side of the membrane.Like regular diffusion, will ONLY occur if there is a higher concentration of molecules on one side of the membrane. Lets see!Lets see!Lets see!Lets see!
  • Slide 5
  • Slide 6
  • Osmosis Osmosis:Osmosis: Movement of WATER from an area of more water (H) to an area of less water (L)Movement of WATER from an area of more water (H) to an area of less water (L) Water moves OPPOSITE of all other molecules (i.e. solutes)!Water moves OPPOSITE of all other molecules (i.e. solutes)!
  • Slide 7
  • How does osmosis work? Across a SEMI-PERMEABLE membraneAcross a SEMI-PERMEABLE membrane Only certain molecules, like water, can move freely across the membraneOnly certain molecules, like water, can move freely across the membrane Water molecules move from HIGH to LOWWater molecules move from HIGH to LOW They want to BALANCE OUT a solutionThey want to BALANCE OUT a solution Therefore, water moves OPPOSITE of other moleculesTherefore, water moves OPPOSITE of other molecules Lets See!Lets See!Lets See!Lets See!
  • Slide 8
  • Example of Osmosis #1 Condition #1: More Water outside of cellCondition #1: More Water outside of cell Inside cell = 98% Water, 2% saltInside cell = 98% Water, 2% salt Outside cell = 100% Water, 0% saltOutside cell = 100% Water, 0% salt Water moves into cell, salt moves out to balance CELL SWELLS or BURSTS!
  • Slide 9
  • Example of Osmosis #2 Condition #2: More water inside of cellCondition #2: More water inside of cell Inside cell: 98% Water, 2% SaltInside cell: 98% Water, 2% Salt Outside cell: 95% Water, 5% SaltOutside cell: 95% Water, 5% Salt Water moves out of cell, salt moves in to balance CELL SHRIVELS!
  • Slide 10
  • Osmotic Pressure Cells behave differently when placed in different solutions!Cells behave differently when placed in different solutions! This is due to OSMOSIS!This is due to OSMOSIS! Most cells are ~ 98% water!Most cells are ~ 98% water! Three types of osmotic pressure:Three types of osmotic pressure: HypotonicHypotonic HypertonicHypertonic IsotonicIsotonic
  • Slide 11
  • Hypotonic Condition Cell is placed in 100% waterCell is placed in 100% water Solution outside of cell has MORE water, less of other materials (i.e., salt)Solution outside of cell has MORE water, less of other materials (i.e., salt) Therefore, solution is below strength (hypo)Therefore, solution is below strength (hypo) 98% Water ENTERS cell 100% CELL SWELLS!
  • Slide 12
  • Red Blood Cells in Hypotonic Solution - YouTubeRed Blood Cells in Hypotonic Solution - YouTubeRed Blood Cells in Hypotonic Solution - YouTubeRed Blood Cells in Hypotonic Solution - YouTube
  • Slide 13
  • Hypertonic Condition Cell is placed in 95% waterCell is placed in 95% water Solution outside of cell has LESS water, more of other materials (i.e., salt)Solution outside of cell has LESS water, more of other materials (i.e., salt) Therefore, solution is above strength (hyper)Therefore, solution is above strength (hyper) Water LEAVES cell 98% 95% CELL SHRINKS!
  • Slide 14
  • Red Blood Cells in a Hypertonic Solution - YouTubeRed Blood Cells in a Hypertonic Solution - YouTubeRed Blood Cells in a Hypertonic Solution - YouTubeRed Blood Cells in a Hypertonic Solution - YouTube
  • Slide 15
  • Isotonic Condition Cell is placed in 98% waterCell is placed in 98% water Solution outside of cell has SAME water, same amount of other materials (i.e., salt)Solution outside of cell has SAME water, same amount of other materials (i.e., salt) Therefore, solution is equal strength (iso)Therefore, solution is equal strength (iso) Water moves equally; Equilibrium exists 98% CELL STAYS THE SAME!
  • Slide 16
  • Red Blood Cells in an Isotonic Environment - YouTubeRed Blood Cells in an Isotonic Environment - YouTubeRed Blood Cells in an Isotonic Environment - YouTubeRed Blood Cells in an Isotonic Environment - YouTube
  • Slide 17
  • Review of Osmosis Isotonic, Hypertonic, Hypertonic Animation You Tube Onion Cell Osmosis
  • Slide 18
  • Active Transport Sometimes, materials will move across the cell membrane AGAINST a concentration gradient.Sometimes, materials will move across the cell membrane AGAINST a concentration gradient. LOW HIGHLOW HIGH This is Active Transport.This is Active Transport. THIS REQUIRES ENERGY!!! Just like pulling something uphill!THIS REQUIRES ENERGY!!! Just like pulling something uphill! Cells get this energy from ATP (Adenosine Triphosphate)Cells get this energy from ATP (Adenosine Triphosphate)
  • Slide 19