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- CELL PROCESSES: OSMOSIS & DIFFUSION
- Cell Membrane-
- Semi-permeable- ability to selectively let substances in and out.
- selectively let substances in and out
- 2. Cell membrane let in smaller molecules like water, oxygen, and carbon dioxide.
- 3. Cell membranes are not permeable to salts, sugars, and other large molecules.
- 4. Substances move into and out of a cell by Active or Passive transport
- Factors that way limit or enhance movement of molecules.
- CONCENTRATION GRADIENT
- MOLECULE WEIGHT
- 2. Diffusion
- Form of PASSIVE transport by which molecules move in and out of a cell without using energy.
- 3. OSMOSIS Form of Passive transport by with water molecules move in an out of a cell without using energy
- Molecules of a substance move from aras f HIGH concentration to LOW concentration
- ****OVER TIME THE CONCENTRATION OF ALL MOLECULES EVEN OUT BOTH SIDES OF THE CELL MEMBRANE****
- HOW DOES DIFFUSION OCCUR?
- Molecules are constantly in motion, bumping into each other.
- More molecules= more collisions
- Collisions cause more molecules to spread away from each other.
- Overtime, all molecules will spread out evenly.
- Plasmolysis- when a cell LOSES water
- Turgor- When a cell GAINS water.
- Hypertonic- a hypertonic solution is one where the concentration of closures is greater outside the cell than inside it.
- HYPOTONIC- A hypotonic solution is one in which the concentration of solutes is greater inside the cell than the outside of it.
- ISOTONIC- A solution inside the cell and outside the cell the is equal concentration.
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