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Diffusion & Osmosis
| Question | Answer |
|---|---|
| What is diffusion? | The movement of molecules from a location of high concentration to a location of low concentration |
| What is a Concentration Gradient? | The difference in concentration of a substance from one location to another. |
| What are the three types of Passive Transport? | Diffusion & Osmosis & Facilitated Diffusion |
| Is energy needed to Passively Transport molecules across the cell membrane? | No, energy is not needed. |
| In diffusion, do the molecules diffuse down a concentration gradient or up against) the concentration gradient? | Down the concentration gradient |
| What drives diffusion? | Brownian Motion |
| What is Brownian Motion? | The random, constant movement of molecules |
| When does diffusion stop? | When Dynamic Equilibrium has been reached (evenly mixed). |
| What is Osmosis? | The movement of water from an area of higher concentration to an area of lower concentration (diffusion) across a semi-permeable membrane. |
| Is Diffusion a form of Osmosis or Osmosis a form of Diffusion? | Osmosis is a form of Diffusion. |
| Name the 3 types of solutions that control Osmosis. | Isotonic, Hypertonic, & Hypotonic solutions. |
| What does the prefix iso- mean? | Equal |
| What is an isotonic solution? | A solution that has the same concentration of dissolved solids inside as outside of the cell. |
| Is there overall Osmotic movement of water when a cell is placed in an Isotonic solution? | No. There may be random movement of water into & out of the cell but there is no Osmosis. |
| What happens to a cell's size when it is placed in an isotonic solution? | The cell's shape remains the same. |
| Is the fluid around our blood cells isotonic, hypertonic, or hypotonic? | Isotonic. |
| What is a Hypertonic solution? | A solution that has a higher concentration of dissolved solids outside of the cell as compared with inside the cell. |
| What does the prefix hyper- mean? | over, above |
| What is the water concentration outside the cell as compared to inside the cell when a cell is placed in a hypertonic solution? | The water concentration is higher inside the cell as compared with the solution outside the cell. |
| In which direction does water flow (Osmosis) when a cell is placed in an hypertonic solution? | The water flowers out of the cell. |
| What happens to the shape of a cell when the cell is placed in a hypertonic solution? | The cell shrinks. |
| What is a Hypotonic solution? | A solution that has a lower concentration of dissolved solids outside the cell as compared with the inside. |
| What does the prefix hypo- mean? | under, below |
| What is the concentration of water outside the cell as compared with inside the cell when a cell is placed in an hypotonic solution? | The water concentration is lower inside the cell as compared with outside the cell. |
| In which direction does water flow (Osmosis) when a cell is placed in an hypotonic solution? | Water flows into the cell. |
| What happens to the shape of a cell when the cell is placed in a hypotonic solution? | The cell swells. |
| When discussing the concentration of a solution, what does Concentration mean? | The amount of particles (molecules) in a known volume. |
| Why do raisins in cereal swell when milk is poured over the cereal? | The milk is an hypotonic solution. Milk (water) osmoses into the raisins causing them to swell. |
| Why might your fingers wrinkle when you have washed alot of dishes? | The soapy water is an hypertonic solution. Water osmoses out of your skin cells and your fingers wrinkle. |
| What does the prefix osmos- mean? | To push. |
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