1 / 16

Osmosis

Osmosis. Honors Biology. Osmosis. Remember – a semi-permeable membrane MUST be present, otherwise it’s just diffusion 3 types of solutions. 3 examples of Osmosis. Cells have molecules of solute (salt, sugar, etc.) inside them.

papina
Download Presentation

Osmosis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Osmosis Honors Biology

  2. Osmosis • Remember – a semi-permeable membrane MUST be present, otherwise it’s just diffusion • 3 types of solutions

  3. 3 examples of Osmosis • Cells have molecules of solute (salt, sugar, etc.) inside them. • Cells will either lose water, gain water, or have an equal flow of water DEPENDING ON how much water AND solute is outside the cell.

  4. 1. Hypertonic • Has too many particles (solute) (“too hyper”) • Too sweet, too salty • A cell placed in a hypertonic solution - water would flow OUT of the cell, causing it to shrivel and perhaps die • Think of water moving TOWARDS the area with the most solute

  5. Hypertonic • In animal cells (shrivels) • In plant cells (plasmolyzed = shrink on inside only) The outside of the cell is “hypertonic” relative to the inside of the cell.

  6. 2. Hypotonic • Means not enough solute (or too much water) • A cell placed in a hypotonic solution - water would flow INTO cell, causing it to swell, and perhaps burst/die • Cell would have more solute (salt) relative to the outside of the cell

  7. Hypotonic • In animal cells (lysis = burst) • In plant cells (turgid = swollen) • Outside of cell is “hypotonic” relative to inside Plant cell - cell walls keep cell from bursting

  8. Ways to remember • If cell placed in hypertonic solution - “you are too hyper, go outside and play = water flows out” • If cell placed in hypotonic solution - “if you don’t come inside you will get hypothermia = water flows into cell”

  9. 3. Isotonic • Means equal concentration of solute compared to the cell • When a cell is placed in an isotonic solution, equal amounts of water enters and exits cell • Cell size remains constant

  10. Isotonic • Flaccid = means “loose” (plant cells) • Just called “normal” in animal cells

  11. Hyper and Hypo Water moves “toward” area that has more solute (particles).

  12. Blood cells – classic example

  13. Good illustration to remember

  14. These are relative terms • Be careful! If a cell is placed into a hypertonic solution: • The solution is hypertonic relative to the cell • The cell is hypotonic relative to the solution

  15. Practice 1. If this cell (50% solute) is placed into a solution (that is 80% solute), which way will water flow? What is the solution? The cell? What % water is the cell? The solution?

  16. Another practice 2. This cell is 60% solute and is placed in a solution that is 45% solute. Which way will water flow? What is the solution? The cell? What % water is the cell? The solution?

More Related