PPT-Osmosis & Cell Transport

Diffusion Movement of particles from HIGH to LOW concentration Caused by a concentration gradient difference in concentration Stops when it reaches dynamic equilibrium equal amounts everywhere . Cell membrane compared to a sieve/colander.. When would you use a colander?. What does a cell membrane and a colander have in common?. All cells are surrounded by a cell membrane. Cell membranes . keep things out and keep things in.. Essential idea: Membranes control the composition of cells by active and passive transport.. The . background image is . a piece of artwork inspired by the complexity of an . E. Coli. . Complexity in cell structure is much . Passive and Active Transport. Lesson Objectives . Understand how equilibrium is established as a result of diffusion.. Distinguish between diffusion and osmosis.. Cellular Membrane. Membrane: function is to control what enters and exits the cell. Overview. The plasma membrane is the boundary that separates the living cell from its . surroundings. It controls what goes in and what goes out. Regulates molecular traffic. The plasma membrane . is a . . Really smelly demonstration…... Put a few drops of vanilla in a balloon. Shake the balloon, then wait about 30 seconds. Smell the outside of the balloon. What’s going on?. EVIDENCE. INFERENCE. Sec 4.3 . pg. 74-75. Osmosis. : . a . special case of diffusion . involving water. water . molecules . move across . a selectively permeable membrane from an area of high water concentration to an area of low water . Leaving Certificate Biology. Higher Level. Selective Permeability. Cell membranes are selectively permeable meaning they can control what enters and leaves the cell. Selective permeability is controlled by proteins embedded in the cell membrane. Essential idea: Membranes control the composition of cells by active and passive transport.. The . background image is . a piece of artwork inspired by the complexity of an . E. Coli. . Complexity in cell structure is much . REVIEW of Passive Transport. Osmosis. is the movement of . water. into and out of the cell membrane. It is a SPECIAL KIND of Diffusion.. Water will move from an area of HIGH water concentration to an area of LOW water concentration on its own with NO ENERGY!. Solution. Solution. Cell Membrane consists of the lipid . bilayer. , carbohydrates, and proteins.. Water can pass right through lipid . bilayer. What is a solution?. A mixture of two or more substances.. (Chapter . 3) . Objectives:. 1- Define a cell and distinguish between cytosol and cytoplasm. . 2- Explain the structure and molecular organization of the cell membrane and list factors determining its selective permeability. . Function of the Cell Membrane:. Cell membrane separates the components of a cell from . its . environment. —surrounds the cell. “Gatekeeper” of the cell—regulates the flow of materials into and out of cell—. Students will describe the structure and function of cells, tissues, organs, and organ systems.. . Explain that cells take in nutrients in order to grow and divide and to make needed materials.. Relate cell structures (cell membrane, nucleus, cytoplasm, chloroplasts, mitochondria) to basic cell functions. . …happens across a semi-permeable membrane. . ONLY WATER. Water is a small but extremely important molecule that makes up most of the liquid part of the cytoplasm in living things. . . Deals . ONLY.