Science 10 Cell Membrane & Cellular Transport (C 2.1-2.4) Notes PDF

12/7/2016 Science 10 The Cell Membrane as a Gate Keeper...

12/7/2016 Science 10 The Cell Membrane as a Gate Keeper Cell Membrane | yas 4 ty The cell is an open system, which means that it allows for the exchange of matter and energy between itself and its surrounding. & Cellular Transport This exchange is, however, regulated by the cell membrane, which selects what is allowed to move in and out. C 2.1-2.4 The function of this selective permeability is to maintain equilibrium, homeostasis, or balance inside the cell. Cell Membrane Structure: The Fluid Mosaic Model Forms of Cellular Transport of cell f The components and structure of the cell membrane allow for the exchange of materials between the cell and its surroundings via a number of different methods. Some of these methods, collectively called passive transport, Inside occur using only the kinetic energy of molecules involved. of cell Prot (cytoplasm) Other methods, collectively referred to as active transport, The cell membrane, also referred to as the plasma require the input of additional energy, provided by a molecule membrane, consists of a phospholipid bilayer. That is to called ATP, produced say that is has a double layer of lipids (fats), each having a through cellular respiration. phosphate group attached on either surface of the membrane. Interspersed in this membrane are proteins. Some of which have sugar molecules (carbohydrates) attached to them. \ ) Co te ene reg (lim Wa) AROMA Energy and Concentration Gradients Types of Passive Transport The difference in energy I. Diffusion requirements has to do with the concentration of molecules inside, © as compared to outside, the cell. Rg eeansstrdnn golich A difference in concentration of molecules is called a concentration gradient. © solute No extra energy (ATP) is required ( Diffusion is the spontaneous movement of particles from an to move molecules down (with) a area of higher concentration to an area of lower concentration. gradient; from an area of high to Leos High Diffusion continues until all particles are evenly spread out; are low concentration. Energy is ( in equilibrium. required to move molecules up (against) a gradient; from an area of Rate of diffusion can be increased by adding energy and low to high concentration. increasing molecular movement. (heating or stirring)  12/7/2016 Diffusion & The Particle Model of Matter 2. Osmosis The occurrence of diffusion is commonly explained using the particle model of matter that states that: S — large spaces exist between the particles of matter. Suge MOUGLES rat RLS A — attractive forces are found between particles. These forces are most significant for solids and least for Osmosis is the diffusion of water across a membrane that is gases. permeable to water, but not the solute (semi-permeable). M -particles are in constant motion. With motion being the Demo Act. C8 p.276: starch and iodine diffusion across a semi- most significant for gases and the least for solids permeable membrane. isotonic solution Hypotonic solution Osmosis & Cell Tonicity : io Tonicity refers to the concentration of a solution in comparison Animal to that of another. kell Knowledge of the tonicity of a solution in comparison to that of a cell allows to predict the direction of water movement Isotonic = same as cell Hypotonic = less solute than cell Plant Hypertonic = more cell solute than cell (E) Turgid Demo: The Incredible Egg Lab Use p.279 Skill Practice as a basis for students to determine why p.280 Refer to video vegetables become crispy when place in a container of water. Assign workbook p. 170518] \—\ 3. Facilitated Diffusion Types of Active Transport | Facilitated Diffusion 1. Active Transport with Carrier Proteins Similar to facilitated diffusion, but requiring energy to move molecules from a low to a high concentration. { 1 May bring needed entities into the cell or expel materials i from the cell. 1 Active Transport i H Protein Channel Carrier Prossin LowConc @ Carrier protein —— | 6 nh Ue a Due to the lipid nature of cell membranes, only fat soluble substance move freely across membranes. Water soluble substance need assistance in the form of a protein channel or carrier protein in order to move across the cell membrane. U UMERSUL AT UWE CeLS) & Facilitate diffusion is still the movement from higher to lower ATP ADP + Pi e Ses e concentration, but with proteins facilitating the movement. High Conc \v  12/7/2016 Uigelds ond smelt olecetentye ee 2. Endocytosis & Exocytosis Types of Endocytosis: Essentially the reverse Phagocytosis and Pinocytosis processes of one another, endocytosis and exocytosis often involve molecules that Phagocytosis involves the intake of larger molecules, while are too large to be transported pinocytosis is the engulfment of liquid and dissolved molecules. across the cell membrane by ENDOCYTOSIS carrier proteins. _ go pane Both endocytosis and 22 si ci@ ie ne 8.8 exocytosis require energy i one “ TROON. ‘5 ‘ — F anes ‘a +(9) from ATP for vesicle lf ‘ } : formation the rearrangement ae Neus we y go on digestive vanuOR of the cell membrane. “{ @) ~ ;. Assign workbook p. 182-183 #18-23 Youtube videos: - § S MennOVUNe 34 ' Cm hy) § Have students complete a flow chart or other graphic § Cellular Transport TONS FE. organizer that summarizes the transport of materials across § Membranes and Transport ( \ Ain » a membrane. (Can be adding details to p.183 #23) § Cett Membranes Rap—(—Chyyniry—) § Computer Simulations and Activities as per next slide. § Crossword Puzzle § Cell Transport Review Worksheet § More: Check and Reflect Questions p.283 #7-9 SUNG re, Futpned Lua. Binw Cdrycee C 2.3 Applications of Cellular Transport Internet Activities in Industry and Medicine - : : —— Knowledge of the cell membrane and cellular transportation § Cellular Transpor’computer simulations and interactive sites : has application in both industry and medicine. 1)http://www.sumanasin¢.gcom/webcontenvanumations! Content/diffusi_| Synthetic membranes are being developed to mimic natural on. html functions. (For diffusion— active transport) 2 Bl ew) j edutisny sy eas isn Membrane mimic |2) https://www.blinn.edwnatsci¢hce/Biology_Tutorials.html Bi Neve abs Ed aa 7 isi + “Yy (Scroll to osmosis and diffusion section and select phagocytosis and pinocytosis) \ 3) https:/Awww.quia. cane sta LORE. html (Online quiz) Qua : COM, L__ = Py i iw j 7 __| [3 Call Me abrir c 4RINspc t-Gure