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Transcript
Osmosis and Diffusion Cells have structures that protect their contents from the world outside. All cells are surrounded by a cell membrane that separates the cell from the outside environment. The cell membrane is selectively permeable Selectively Permeable - some substances can _____________ the membrane while others _________________________________ Substances can move into and out of a cell be one of ______methods: 1. Diffusion 2. Osmosis 3. Active ________________Diffusion – is the process by which _________________________ of __________________________ to an area of lower concentration – diffusion is the main method by which small molecules move across the cell membrane! What causes diffusion? Molecules are always moving and as a result, they bump into each other (collide). When collisions occur, molecules move push away from one another and spread out. Eventually, they will spread out evenly throughout the area. Osmosis – is the diffusion of water molecules through a _______________________________ – cells cannot function properly without water, so many cellular processes depend on osmosis **In osmosis, water molecules move by diffusion from an area of high concentration (a lot of H2O molecules) to an area of low concentration (few H2O molecules)**