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Cell Transport II: Diffusion and Osmosis Christopherson Homeostasis The ability of an organism to adjust its internal environment to keep it stable. Where are WE? Tissue Organism Cell Transport is fueled by the need of the cell to maintain homeostasis Diffusion Movement of particles from an high concentration to a low concentration; reach homeostasis High Low What is concentration? The amount of a substance High concentration means there is a lot present External examples of diffusion a. Food coloring and water High concentration (amount of substance) Low concentration External examples of diffusion b. Lotions/Perfume/Unpleasant odors in a closed room Substances that can diffuse across the cell membrane Certain substances can diffuse straight across the phospholipid bilayer Phospholipid bilayer Examples of Diffusion a. Oxygen and Carbon dioxide exchange in the blood Osmosis: Introductory Terms Solution: A mixture of two or more substances; both are completely dissolved Osmosis: Introductory Terms Solvent: The dissolver; usually a liquid Osmosis: Introductory Terms Solute: Disolvee; what is being dissolved Osmosis Movement of WATER from a high to a low concentration Hint: a. Water will ALWAYS move to the higher concentration of dissolved substances. Hint: b. Solute SUCKS solvent (water)!!!! Solute Water Isotonic Solution • Cell remains same size • Water moves in and out at same rate (time) • The concentration of dissolved substances is equal in and out of cell. *RBC Video *Elodea Video Hypo = Hippo (BIG!!! SWOLLEN!!) Hypotonic Solution • Cell swells • Water moves in • The higher concentration of dissolved substances is __________ the cell. *RBC Video *Celery Video Hyper = Hyperactive (Want energy out!!!) Hypertonic Solution • Cell shrinks • Water moves out • The higher concentration of dissolved substances is __________ the cell. *RBC Video *Elodea Video *Onion Video Review Select LINK; read and work through the virtual lab What would happen if a Clown Fish (Nemo) was placed in a freshwater aquarium? SALT Water would move into the fish cells causing all of the cells to swell and burst; it is a hypotonic environment What would happen if a Goldfish was placed in the ocean? Water would move out of the fish cells causing all of the cells to shrink; it is a hypertonic environment SALT