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1.7 and 1.8 Cells in Their Environment and Osmosis

1.7 and 1.8 Cells in Their Environment and Osmosis. Text pages 22-28. The Big idea. How do substances move in and ou t of cells. Video . http:// www.youtube.com/watch?v=qotIWgL7zFs. http:// www.youtube.com/watch?v=9QCxTf0QfTo&feature=related. 1.7 Cells in Their Environment.

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1.7 and 1.8 Cells in Their Environment and Osmosis

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  1. 1.7 and 1.8 Cells in Their Environment and Osmosis Text pages 22-28

  2. The Big idea • How do substances move in and out of cells

  3. Video http://www.youtube.com/watch?v=qotIWgL7zFs http://www.youtube.com/watch?v=9QCxTf0QfTo&feature=related

  4. 1.7 Cells in Their Environment • Permeable (all), semi permeable (some) and impermeable (none)

  5. Cell membrane: • Selectively permeable (pg 22)

  6. Diffusion • Molecules constantly move and collide, causing them to spread out • Concentration= the amount of stuff in a specific area • Molecules always move from an area of high concentration to an area of low concentration • This is how things move in and out of cells (see page 24)

  7. 1.8 Osmosis (page 25) • Osmosis: • A type of diffusion involving to water • Water constantly moves in and out of cells depending on concentration • See page 25 of text

  8. Cells in solutions of different concentrations • Solute = substance dissolved in another substance • Solvent= stuff that does the dissolving • E.g., hot chocolate= water (solvent) and chocolate (solute) • In cells salts and sugars = solutes, and water = solvent

  9. Examples of Osmosis (see page 26) Example 1: Equal movement of water in and out of cells

  10. Example 2: More water moving into cells than is moving out

  11. Example 3: More water moving out of cells than is moving in

  12. Turgor Pressure • the main pressure of the cell contents against the cell wall in plant cells. • cells contain more water in vacuole than flaccid cells (osmotic pressure) • gives the plant rigidity, and may help to keep it erect. Turgor can result in the bursting of a cell.

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