# Fluid mosiac model of the cell membrane

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1 Cellular Transport Transport in cells: movement of molecules across the cell membrane GOAL: homeostasis biological balance in an organism 3 phases of matter stabilityequilibrium solid liquid gas brownian motion constant, random movement equilibrium Nov 15 8:09 AM REVIEW! Fluid mosiac model of the cell membrane Nov 15 9:52 AM 1

2 Types of Transport FINAL 2015 with notes.notebook Cellular Transport Key concepts 1. Each cell interacts with body ﬂuids through the interchange of substances across the cell membrane. 2. Substances move between cells and body ﬂuids by one of four main mechanisms: diﬀusion, osmosis, acve transport, and passive transport. Present The Content Gain Attention 2

3 REVIEW! solutions mixture w/one substance dissolving into another a. solvent one doing the dissolving b. solute one being dissolved ex. sugar water salt water universal solvent water aqueous solution solvent is water Nov 15 8:14 AM Calculating Concentration Write the answers to the simple math problems. Mass of Solute / Volume of Solvent = Concentration 0 Mass of Solute Volume of Solvent Concentration 5g 100ml 0.05 g/ml 10g 100ml 0.10 g/ml 20g 100ml 0.20 g/ml 20g 200ml 0.10 g/ml Calculating Concentration 3

4 Types of Transport FINAL 2015 with notes.notebook Passive Transport Any molecule that can fit the protein channel passes through the cell membrane (diffusion.) No cell energy is used. Active Transport Cell energy (ATP) is used to move large particles through the cell membrane. Mar 22 1:50 PM ` Acve Transport Transport method that moves a substance across the cell membrane (a carrier molecule in the cell membrane combines with the substance, transports it through the membrane, and deposits it on the other side of the membrane). Usually, a substance moves from an area of lower concentraon to an area of higher concentraon (against the concentraon gradient). A substance may move from an area of higher concentraon to an area of lower concentraon (with the concentraon gradient). Requires energy from ATP breakdown to transport a substance across a cell membrane. https://www.youtube.com/watch?v=aaj5gq041_y Mar 22 1:47 PM 4

5 Students will go through the interactive activity in groups of three and answer the questions on the next page. Provide Learning Guidance PASSIVE TRANSPORT transportation without energy, usually from high concentration to low concentration 1) Diffusion 2) Osmosis 3) Facilitated Diffusion Apr 24 9:07 AM 5

6 Diffusion Key concepts 1. Passive method that doesn t require cellular energy. 2. Dissolved particles (solute) move from an area of higher concentration to an area of lower concentration. hill.com/sites/ /student_view0/chapter2/ animation how_diffusion_works.html Mar 24 12:09 AM Diffusion Touch the red divider to watch the dye diffuse and write your observations. Diffusion Moving from a high to a low concentration area. Observations: Diffusion 6

7 One Factor that influences the diffusion rate: Concentration Gradient 1. The difference in parcle concentraon on either side of the plasma membrane affects diffusion. 2. The greater the concentraon gradient, the faster diffusion occurs small parcles diffuse more rapidly than large parcles High Concentration Gradient Low Mar 22 2:09 PM Apr 24 9:11 AM 7

8 Types of movement 1.diffusion PLAN A moves: CO, small molecules, ions, lipid soluble, O direction: high to low concentration end result: equilibrium energy: passive 2 2 High concentration gradient Nov 15 8:37 AM Low Diffusion in Everyday Life Touch images to see examples of diffusion and write observations. Observations: Diffusion in Everyday Life 8

9 Prediction: Diffusion in the Human Body Write your prediction about what happens to oxygen as it diffuses through the body. Erase within the red circles for a hint. Lungs Capillary Cell Diffusion in the Human Body 2)Facilitated diffusion occurs when a carrier molecule in the cell membrane picks up t diffusing substance on one side of the membrane and deposits the other side. animation how_facilitated_diffusion_works.html Apr 24 9:13 AM 9

10 3) Osmosis 1. Passive transport method that involves movement of WATER from a soluon of higher concentraon to one of lower concentraon through a semi permeable membrane. 2. Water moves from a dilute soluon (with a higher concentraon of water molecules) to a concentrated soluon (with a lower concentraon of water molecules). Mar 23 6:02 PM Osmosis Mar 22 1:47 PM 10

11 Osmosis Tap the image to see osmosis at work. Write your observations. Observations: Osmosis concentrationvarying amounts of solute in solution solute per solution 5 grams of salt + 95 ml of water = 5% salt solution 10 grams of glucose + 90 ml of water = 10% glucose solution tonicity way of describing concentrations 1. hypertonic high amount or concentration of solute 2. hypotonic low amount or concentration of solute 3. isotonic equal concentration of solute to solvent Nov 15 8:21 AM 11

12 2. osmosis: PLAN B moves: H 0 2 direction: hypotonic solution to hypertonic solution end: isotonic energy: passive concentration gradient High Low Nov 16 8:23 AM Dec 14 11:58 AM 12

13 Osmosis and your cells 10 % NaCl 5% NaCl Nov 16 8:25 AM Apr 27 10:20 AM 13

14 Osmosis and your cells 2 % NaCl 5% NaCl Jan 4 9:27 AM Apr 27 10:26 AM 14

15 Osmosis and your cells 5 % NaCl 5% NaCl Jan 4 9:32 AM Osmosis in Nature Tap the watering tank and watch osmosis fill the plant's cells. Write your observations. Observations: Osmosis in Nature 15

16 Perform an Experiment 1)Drag potatoes to scale, record weight. 2)Put potatoes in beakers, record weight. 3)Note the gain or loss of mass. Perform an Experiment Graph the Data Touch and drag the bars on the graph to the correct data points. Graph the Data 16

17 We can all enjoy clean water thanks to the process of osmosis and reverse osmosis! Reverse osmosis removes up to 99% of feed water contaminants. As the feed water approaches the reverse osmosis membrane, impurities deposit on the surface of the reverse osmosis membrane and are flushed away to the drain. The purified product water that passes through the membrane is cleared of up to 99% of its impurities. Enhance Retention and Transfer to the Job CELL TRANSPORT Grade:«grade» Subject:«subject» Date:«date» Apr 24 9:17 AM 17

18 Apr 27 10:48 AM Apr 27 10:47 AM 18

19 1 If you drop food coloring into water it will. A B C D spread out evenly stay clumped at the surface drop to the bottom solidify into a hard ball Review Question 2 If I add two drops of food coloring to one glass and ten drops of food coloring to the second glass, the second glass is more. A full B diluted C diffused D concentrated Review Question 19

20 3 To dilute dark red water with food coloring in it, you would. A get a second glass B add more food coloring C add more water D stir it Review Question 4 Oxygen gets into our blood by. A B C D osmosis out of the capillaries diffusion out of capillaries diffusion from the lungs osmosis from the lungs Review Question 20

21 5 If you have half a glass of sugar water with a concentration of 4.5 g/cm3 and you add half a glass of sugar water with a concentration of 10.0 g/cm3, the new solution would be. A B C D less concentrated more concentrated the same concentration impossible to determine Review Question 6 3 grams of salt dissolved in 10 cm3 of water would have a concentration of. A 0.3 g/cm3 B 3.0 g/cm3 C 30.0 g/cm3 D g/cm3 Review Question 21

22 7 Water flows from: A high concentration to low concentration B low concentration to high concentration C D high concentration to high concentration low concentration to low concentration Review Question 8 A plant is able to stand up straight by: A using water flowing into its roots B letting water flow out of its roots C D using salty water using water flowing downhill Review Question 22

23 9 If I place a potato into very salty water it will: A gain mass B lose mass C D stay the same mass grow Review Question 10 If a potato initially masses 23.5 g and masses 24.6 g after being in fresh water, the change in mass is: A g B 2.1 g C D g 1.1 g Review Question 23

24 Osmosis animation hill.com/sites/ /student_view0/chapter2/ animation how_osmosis_works.html Osmosis in the Kitchen OSMOSIS RAP Oct 23 10:28 AM Osmosis and the protist paramecium transport.htm#brownian_movement Nov 16 8:53 AM 24

25 Osmosis and the plant cell Nov 16 8:54 AM We can all enjoy clean water thanks to the process of osmosis and reverse osmosis! Reverse osmosis removes up to 99% of feed water contaminants. As the feed water approaches the reverse osmosis membrane, impurities deposit on the surface of the reverse osmosis membrane and are flushed away to the drain. The purified product water that passes through the membrane is cleared of up to 99% of its impurities. Enhance Retention and Transfer to the Job 25

26 3. Facilitated diffusion what moves: large molecules, water soluble, through carrier proteins direction of movement: hypertonic to hypotonic end result: energy: isotonic passive concentration gradient High Low Nov 16 8:41 AM 4. Ion Channel aka Gated Channel what moves: ions, VERY specific, not lipid soluble, open in response to chemical or physical stimuli ex. Na + +, K, Cl direction: hypertonic to hypotonic end result: isotonic energy: passive High concentration gradient Low Nov 21 7:53 AM 26

27 5. Active Transport aka Cell membrane pump What moves: LARGE molecules or ions, water soluble moves through carrier proteins ex: NaK pump nerve impulses, muscle contractions Direction: hypotonic to hypertonic UP the concentration gradient concentration gradient End result: unequal High Energy: active Low Nov 21 7:56 AM Nov 21 8:01 AM 27

28 Endocytosis bringing materials into a cell what moves: large molecules that can't get through the cell membrane direction of movement: into a cell end result: leave blank, draw a line through energy: active Two types of endocytosis: Nov 21 8:18 AM pinocytosis cellular drinking Nov 21 9:00 AM 28

29 phagocytosis cellular eating Nov 21 9:04 AM exocytosis: removal from a cell what moves: large molecules that don't fit through the cell membrane ex. waste products direction of movement: out of the cell end result: leave blank energy: active Nov 21 9:03 AM 29

30 exocytosis Nov 21 9:01 AM Students will go through the interactive activity in groups of three and answer the questions on the next page. Provide Learning Guidance 30

31 Review of cellular transport! VIDEOS Dec 19 9:35 AM Aug 11 2:17 PM 31

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