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Transcript
Structure of the Cell Membrane Outside of cell Proteins Lipid Bilayer Transport Protein Animations of membrane Go to structure Section: Carbohydrate chains Phospholipids Inside of cell (cytoplasm) Cell Boundaries/ Cell Membrane Animal cell Plant cell Cell / Plasma Membrane Cell Wall – provides support & protection, usually made of tough fibers 1. The Cell Membrane Complex barrier separating the cell from it's external environment – Holding cytoplasm within cells – Regulating substances entering and exiting cells – Recognizing other cells – Provides protection and support Is arranged in a double layer called a Lipid Bilayer – Made up of Phospholipids (a phosphate group & 2 fatty acids) 1. The Cell Membrane "Selectively Permeable" membrane that regulates (like a gate) what passes into and out of the cell 1. The Cell Membrane Cell Membranes are FLUID Lipids and Proteins of the Cell Membrane are always in motion 1. The Cell Membrane Membrane Proteins – PROTEIN MOLECULES are EMBEDDED in the Lipid Bilayer – HELP to MOVE Material INTO and OUT of the Cell 1. The Cell Membrane – Often have carbohydrates attached to them to serve as I.D. badges that allow cells to recognize each other 1. The Cell Membrane Diffusion – Movement of particles from an area of high concentration to an area of low concentration (no energy required) (put dye in water) Osmosis – Diffusion of water through a selectively permeable membrane 1. The Cell Membrane Facilitated Diffusion / Passive Transport – Uses proteins to move molecules through a cell membrane along the concentration gradient (no energy required) 1. The Cell Membrane Active Transport – Uses proteins to move molecule against the concentration gradient – Requires energy Exocytosis and Endocytosis Exocytosis – process of a cell releasing materials (exiting) Endocytosis – process of cell taking materials in (entering) Exocytosis Example of both: Nerurotransmitter Isotonic – The concentration of solutes is the same inside and outside the cell – Water moves in and out Hypertonic – Solution has a higher solute concentration than the cell – Water moves out Hypotonic – Solution has a lower solute concentration than the cell – Water moves in Cellular Transport Review Diagrams Active Transport Examples Diffusion/ Facilitated Diffusion Osmosis Cell Transport Concept Map Name Date Cell transport involves the exchange of molecules through the Against the concentration gradient (low to high) Down the concentration gradient (high to low) large molecules transported by requires small molecules move through moved by of water in out Small molecules move through Larger molecules move through examples Example: Example: also called Word Bank: Active Transport Passive Transport Diffusion Facilitated Diffusion ATP Energy Glucose/Amino Acids/Ions Wastes/Secretions Cell Membrane (2X) Osmosis Food/Bacteria Proteins (2X) Endocytosis Exocytosis Youtube http://www.youtube.com/watch?v=HqKlLm2MjkI Which cell process will move substances against a concentration gradient? [NC08 EOC] A B C D E diffusion facilitated diffusion osmosis passive transport Requires ENERGY active transport Which diagram represents active transport? [TN09 EOC]