Tonicity.

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Presentation transcript:

Tonicity

Tonicity Describes the ability of a solution to cause a cell to gain or lose water. It depends on the concentration of a solute.

Solutions Remember that a solute is dissolved into a solvent to make a solution. Solute + Solvent  Solution

What are the parts of a solution?

Types of Solutions There are 3 types of solutions. This is based on a comparison of the concentration of solute (the part being dissolved) in each. Imagine placing a cell into a solution and comparing the concentrations of solute in both. Solution Cell

Types of Solutions 1) Isotonic Solution – The concentration of solute and water in the cell is equal to outside the cell. Water is moving = into and outside of the cell, EQUALLY! Draw and label the pics. Normal in animal cells Solution Cell Flaccid (not firm) in plants

Which way does water move in an isotonic solution?

In each of the following solutions, osmosis takes place In each of the following solutions, osmosis takes place. Remember this rule: WATER FOLLOWS SOLUTE, =SOLUTE SUCKS

Which way will water move during osmosis? What is the rule?

Remember: Solute Sucks draw and label the pics in your IAN

Types of Solutions 2) Hypotonic Solution – concentration of solute is less and water greater outside the cell. Water will follow the solute and move into the cell to try and create a balance, equilibrium, homeostasis. The cell will swell up. An animal cell will undergo cytolysis=lysed=burst (draw, label pics) A plant cell has a cell wall so it will not burst, but will be come very TURGID, they swell and are firm, Normal for plants. Cell

In a hypotonic solution, where is the higher concentration of solute In a hypotonic solution, where is the higher concentration of solute? (inside or outside of the cell?) Which way will water move?

Types of Solutions 3) Hypertonic Solution – The concentration of solute is greater and concentration of water is less outside the cell. Water will move out of the cell to try and balance the concentrations so the cell will shrivel. An animal cell will undergo crenation (shriveling) (draw, label pics) A plant cell has a cell wall that remains the same but the cytoplasm will shrivel inside the cell membrane, which is called plasmolysis (plasmolyzed). Cell

In a hypertonic solution, where is the higher concentration of solute In a hypertonic solution, where is the higher concentration of solute? Which way will water move?

Types of Solutions flaccid