Moving Materials Across The Cell Membrane

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1 1. Active transport: movement of large molecules across the cell membrane that uses the cell's energy. 2. Diffusion:the movement of molecules from an area of high concentration to an area of low concentration. 3.Endocytosis: The movement of very large particles into the cell. Energy is used and a vesicle is formed. 4. Exocytosis: A vesicle joins with the cell membrane and large particles are released. 5. Facilitated diffusion: Molecules enter the cell through openings created by proteins in the cell membrane. 6. Osmosis: diffusion of WATER. 7. Passive transport: Movement of molecules across the cell membrane that does NOT require the cell to use its own energy. (diffusion, facilitated diffusion and osmosis) Feb 12 8:18 AM Moving Materials Across The Cell Membrane Jan 25 4:42 PM 1

2 . Predict what will happen when the stopper is removed from the perfume bottle. Jan 4 9:01 AM Identify the small brown objects. Describe what you are observing. Jan 25 5:04 PM 2

3 Feb 1 3:52 PM Feb 1 4:14 PM 3

4 Jan 31 1:56 PM Feb 1 3:19 PM 4

5 Molecules move to achieve equilibrium a state of equal concentration equilibrium Feb 1 4:18 PM O O O O O O O O O OXYGEN ATOM Nov 16 8:05 PM 5

6 Observe the red molecules. Over time the red molecules diffuse from an area of high concentration to an area of low concentration. Diffusion stops when the red and blue molecules are in equilibrium. Feb 7 2:58 PM Jan 25 5:16 PM 6

7 Jan 25 5:25 PM Feb 1 3:55 PM 7

8 Feb 1 4:17 PM Feb 1 5:59 PM 8

9 Selectively permeable membrane A membrane that allows only certain materials to cross it Jan 4 9:01 AM This type of membrane limits what can enter or exit the cell. water glucose Feb 1 11:47 AM 9

10 4. The balls cannot pass through the mesh bag because they are too large to fit through the openings in the mesh bag. 6.Two other materials that can pass through the mesh bag are water (liquids), gasses such as air or oxygen, sugar, salt, flour,and very small pebbles, or any material that is smaller than the openings in the mesh bag. Feb 25 8:43 AM 5. Other materials that could remain in the bag are bricks, a bowl, a shoe (not Barbie's),or any other object that is larger than the openings in the mesh bag. 7. The mesh bag is considered to be selectively permeable because it allows only objects that are smaller than the openings to pass through. 8. The illustration shows passive transport because no energy was used to move the sand through the openings in the bag. Feb 25 8:48 AM 10

11 CELL MEMBRANE protein Feb 7 2:22 PM Feb 1 5:20 PM 11

12 Feb 1 5:22 PM Feb 1 3:28 PM 12

13 Feb 7 2:29 PM starch(white) added to iodine = blackish purple Iodine is an indicator that turns blackish purple when added to starch. Feb 26 8:46 AM 13

14 Feb 1 6:31 PM sugar molecules Feb 1 6:35 PM 14

15 Sugar molecules move through the protein channel. sugar molecule Feb 7 11:08 AM Feb 7 2:35 PM 15

16 Feb 1 5:22 PM OSMOSIS: The movement of WATER molecules across a selectively permeable membrane. Jan 25 4:48 PM 16

17 Feb 7 2:59 PM The Effect of Osmosis on Animal and Plant Cells BURST! Feb 7 2:38 PM 17

18 Feb 27 12:04 PM Distilled water is 100% water with NO other dissolved materials. Feb 7 10:55 AM 18

19 Osmosis Which way will the water flow? Salt Water Fish Fresh Water Fish 95% water 5% other minerals } Fresh water 80% water 15% salt 5% other minerals } Salt water Nov 16 8:43 PM Active Transport Feb 4 2:52 PM 19

20 Feb 8 9:53 AM WASTE Feb 8 11:27 AM 20

21 ENDOCYTOSIS Feb 4 3:20 PM Feb 7 3:01 PM 21

22 EXOCYTOSIS Feb 4 3:22 PM Feb 8 11:35 AM 22

23 Passive Transport: The movement of molecules from an area of high concentration to an area of lower concentration without the use of energy Passive Transport 3 Types Diffusion Facilitated Diffusion Osmosis The movement of water from high to low The movement of molecules other than water from high to low The movement of some large molecules using protein channels. Nov 16 8:34 PM Active Transport: The movement of substances across a cell membrane using energy Active Transport Move substances from low to high concentration Endocytosis: Exocytosis Nov 17 8:43 PM 23

24 Active Transport: The movement of substances across a cell membrane using energy Active Transport Move substances from low to high concentration Endocytosis: vesicles bring materials IN Exocytosis vesicles carry materials OUT! Nov 17 8:43 PM Go to these web sites to view the animations I showed in class html Feb 1 1:29 PM 24

25 GUMMY BEAR OSMOSIS Feb 21 10:20 AM Feb 27 12:47 PM 25

26 If I put the gummy bear in water for 24 hours, then the gummy bear will, because. Feb 27 12:47 PM Feb 27 12:47 PM 26

27 Feb 27 12:47 PM % Change in Height After Soaking Height Before soaking Height / Before Soaking Height X Feb 21 8:38 AM 27

28 Feb 27 12:48 PM % CHANGE WIDTH MASS HEIGHT Feb 21 9:27 AM 28

29 Feb 27 12:47 PM EGG OSMOSIS Feb 21 10:11 AM 29

30 Diffusion across a dialysis membrane. starch molecule iodine molecule water molecule Jan 25 4:53 PM Osmosis in Plant Cells Observe Elodea leaves 10% NaCl 90% water Predictions? Plasmolysis Hypertonic Distilled water Hypotonic htp:// Jan 4 9:01 AM 30

31 Transportation of Molecules Passive Transport Active Transport Jan 4 9:01 AM What is Passive Transport? no energy required Ex: Diffusion, Osmosis and facilitated diffusion Facilitated Diffusion: Movement of molecules across a semi-permeable membrane with a transport protein. Used to move large molecules Nov 16 7:48 PM 31

32 Nov 20 6:18 PM Jan 5 2:16 PM 32

33 Feb 22 11:36 AM 33

34 Attachments gerisch4.avi Diffusion amp osmisisdiffusionannimation13.mht

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