Types of Cell Membranes Permeable Allows any substance

Types of Cell Membranes Permeable • • Allows any substance to flow freely Lose essential nutrients and admits harmful chemicals Hg (mercury) Outside Permeable Cell Membrane Ca 2+ Inside

Types of Cell Membranes Impermeable • Nothing can enter or leave therefore waste cannot exit and nutrients can not enter the cell Ca 2+ Outside Impermeable Cell Membrane Inside

Types of Cell Membranes Selectively Permeable • Allows specific substances to enter or leave • Based size, charge, fat-soluble Ga Ca 2+ te Outside Gate Selectively Permeable Cell Membrane Ca 2+ Ga te Gate Inside

Types of Solutions Hypotonic • The concentration of water outside the cell is greater than inside • Water continuously enters the cell causing cytolysis Environment Cell Water

Types of Solution Hypertonic • Concentration of water is greater inside the cell, water leaves the cell causing dehydration (plasmolysis) Environment Cell Water

Types of Solution Isotonic • Equal balance of water inside and outside of the cell, therefore what goes in must come out Environment Cell Water

Solution Applications • No fresh water fish in salt water (hypertonic) – dehydrate • No salt water fish in fresh water (hypotonic) – explode • Salt on wounds (hypertonic) – kills bacteria by dehydrating them • Salt as a preservative (hypertonic) – kills bacteria • Storing food in alcohol (pickling) (hypertonic) – kills bacteria