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Answer at the top of your guided notes for today

Discover the dangers of water intoxication and how it can lead to death. Learn about cellular transport and how it helps maintain the balance of water and salt in our bodies. Explore the concepts of solute, solvent, solution, concentration, and dynamic equilibrium.

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Answer at the top of your guided notes for today

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  1. Answer at the top of your guided notes for today • Can you drink too much water? Can you drink so much water that it kills you? Explainyour answer.

  2. Yes! • SACRAMENTO, Calif.  Jennifer Strange, 28, was found dead in her home due to water intoxication hours after taking part in the “Hold Your Wee for a Wii” radio contest which promised a Nintendo Wii video game system for the winner.

  3. Drinking too much water is called water intoxication, or hyponatremia, which means that your blood is too diluted and does not contain enough salt. Without the right balance of salt and water, your brain cells swell and burst, leading to death. • How do our bodies maintain that balance?

  4. Cellular Transport Part 1

  5. Essential question • How does cellular transport help us stay alive?

  6. objectives • By the end of this lesson I will be able to: • Understand how cellular transport contributes to homeostasis • Identify solute, solvent, and solution • Describe concentration • Predict what will happen to a cell in an isotonic solution, a hypertonic solution, and a hypotonic solution • Differentiate between passive and active transport

  7. Dynamic equilibrium • Continuous movement but no overall change • Think: I have 25 students in my class. Two leave, then three enter, then one more leaves. How many students am I left with? • The balance is maintained

  8. Take out a sheet of paper. Put your name on it. Using complete sentences, write step by step how you make Kool-Aid.Must be completed silently!You have 5 minutes.When finished, come get a cup.

  9. solutions • Solvent – the larger material {liquid} that dissolves the solute • Water is considered the “universal” solvent • Solute – smaller substance that is dissolved by the solvent. • Ex. salt & sugar • Solution – Complete mixture of solute and solvent • Ex. Sweet tea

  10. Concentration • Definition: The amount of solute in a given solution • For example, the more people in a classroom, the higher the concentration. • People=“solute” • Room=“solution” • Write your own example. Describe the meaning of concentration to a non-biology student.

  11. Concentration review • In one cup, you put half a packet of Kool-Aid powder. • In the next cup, you put the whole packet in. • Which cup contains the more concentrated solution?

  12. Quick Check! Go back to your Kool-Aid recipe. Rewrite it correctly including the following vocabulary words: solute, solvent, solution, concentration, and dynamic equilibrium

  13. Why did that woman’s brain cells swell?**Write your thoughts down on your notes • Water moves from a high concentration to a low concentration

  14. Osmosis • Osmosisis the process of watermoving from high to low concentration across a membrane.

  15. The three types of solutions**The name describes the amount of soluteoutside of the cell

  16. isotonic • When a cell is in a solution that has the same concentration of water and solutes • Solution has achieved dynamic equilibrium All solutions make changes to be isotonic

  17. hypertonic • A cell is in a solution that has a higher concentration of solute outside of the cell • Hyper means higher {more concentrated} • Think: more salt outside the cell, therefore less water outside the cell • Where will the water move?

  18. hypotonic • A cell is in a solution that has a lower concentration of solute outside of the cell • Hypo means lower {less concentrated} • Think: less salt outside the cell, therefore more water outside the cell • Where will the water move?

  19. predict • You put red blood cells into the following solutions: • Isotonic • Hypotonic • Hypertonic • Predict what will happen in each of the solutions. Think: Where will the water move?

  20. answers • In an isotonic solution, the cell will stay the same size • In a hypertonic solution, there is more solute (and therefore less water) outside the cell. Water will move outside the cell and therefore shrink. • In a hypotonic solution, there is less solute (and therefore more water) outside the cell. Water will move inside the cell and therefore swell.

  21. Back to the essential question • How does cellular transport help us stay alive? • Things “naturally” move from a high concentration to a low concentration. Why?

  22. Passive Transport Hypertonic High Low Concentration Concentration (hypertonic) (hypotonic) Hypotonic Movement of materials in & out of the cell without {NO} Energy

  23. Active Transport High Low Low Movement of materials in & out cell WITH energy

  24. Gummi bear mini-lab • Take out your gummi bear predictions • HW: rewrite what actually happened using the following: osmosis, hypotonic, hypertonic, isotonic, and concentration. Be sure to say if osmosis is an example of passive or active transport.

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