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DO NOW 1. Get out your buffer lab 2. Which substance’s pH changed the most when acid was added? What about when base was added? 3. Why did the pH changes occur? 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 a 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 Hypotonic Solution • Cell swells • Water moves in • The higher concentration of dissolved substances is __________ the cell. *RBC Video *Celery Video Hypertonic Solution • Cell shrinks • Water moves out • The higher concentration of dissolved substances is __________ the cell. *RBC Video *Elodea Video *Onion Video Do Now 1. Explain what is happening in the picture below. HINT: the white circles represent water; black circles are sugar. 2. How can you recognize a hypotonic environment?