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Do you want me to diffuse?

TONICITY-

REVIEW FROM LAST CLASS, PG 74-75

1.

2.

3.

Tonicity refers to the strength of solution in relationship to osmosis.

3 terms to know:

Isotonic

Hypotonic

Hypertonic

The strength of solution will determine the direction water will move!

ISOTONIC SOLUTIONS

• iso = “the same” & tonic = “solution”

• concentration of solute outside cell is the same as the solute concentration in the cell

• water moves into cell at equal rate to water moving out

• cell stays the same, is at

EQUILIBRIUM

HYPOTONIC SOLUTIONS hypo = “lower”

• solute concentration OUTSIDE cell = LOWER

More water outside cell

 water moves

INTO

cell

• cell swells

LYSIS

–bursting may occur in animal cells

TURGOR PRESSURE

builds up in plant cells

Vacuole pushes outwards against cell wall

HYPERTONIC SOLUTIONS hyper= “ higher”

• solute concentration outside cell is higher

• water concentration is lower outside cell

• net movement of water

OUT OF

cell

CRENATION

occurs in animal cells

PLASMOLYSIS

occurs in plant cells

A) B) C)

D) E) F)

HOW MIGHT THESE SITUATIONS RELATE?

How can we get this ring off?

Can tonicity

Help?

YOUR MISSION TODAY:

Work on the critical thinking Qs using the tonicity vocab to EXPLAIN…

Present your Cell Membrane Model to me

Prepare for CHECKPOINT NEXT CLASS on:

Cell Membrane, Diffusion, Osmosis

OSMOSIS LINKS

• http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm

(tonicity) http://ull.chemistry.uakron.edu/genobc/animations/collapse.mov

(crenation)

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