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OSMOSIS

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UNDERSTANDING LIFE SYSTEMS CELLS

3.4  explain the processes of diffusion and osmosis and their roles within a cell

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CURRICULUM

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OSMOSIS

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SOLUTE

SOLVENT

SOLUTION

A solute is anything that is dissolved in a solvent

=

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SOLVENT

SOLUTE

SOLUTION

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CONCENTRATION OF A SOLUTE

a high concentration =

    • many solute particles
    • fewer water particles

​

a low concentration =

    • fewer solute particles
    • more water particles

is determined by the number of particles that are dissolved

SOLUTE

SOLVENT

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BALANCE

When the solute concentration is higher on one side of a selectively permeable membrane than the other, the water will move towards the side with the higher concentration

  • trying to make the concentrations equal

​

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CELL SIZE CHANGES IN DIFFERENT TYPES OF SOLUTIONS

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HYPOTONIC

ISOTONIC

HYPERTONIC

(LESS OUTSIDE)

(SAME)

(MORE OUTSIDE)

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ISOTONIC

when a cell is in an isotonic solution

…

the size stays the same

(the same concentration inside the cell and outside the cell),

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HYPERTONIC

when a cell is in a hypertonic solution

…

the cell SHRINKS

water moves OUT of the cell

(higher concentration outside the cell)

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HYPOTONIC

when a cell is in a hypotonic solution

…

the cell SWELLS

water moves INTO the cell

(higher concentration outside the cell)

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CELL SIZE CHANGES IN DIFFERENT TYPES OF SOLUTIONS

  • when a cell is in an isotonic solution the size stays the same
  • when a cell is in a hypertonic solution the cell SHRINKS
    • water moves OUT of the cell
  • when a cell is in a hypotonic solution the cell SWELLS
    • water moves INTO the cell

​

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PLANTS & OSMOSIS

  • plants use osmosis to keep their central vacuole filled
  • this keeps pressure on the cell and pushes it against the cell wall (turgor pressure)

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PLANTS & OSMOSIS

high turgor pressure keeps the cells firm and the plant standing �up

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EGG-CELLENT OSMOSIS

PREDICT

OBSERVE

EXPLAIN

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PREDICT

OBSERVE

EXPLAIN

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HYPOTONIC

WATER

HYPERTONIC CORNSYRUP

PREDICT

P

PREDICT

OBSERVE

EXPLAIN

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PREDICT

P

IF/THEN STATEMENT

IF…

If we put the egg in the hypertonic corn syrup,

THEN…

then it will ?????????

PREDICT

OBSERVE

EXPLAIN

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HYPOTONIC

WATER

HYPERTONIC CORNSYRUP

OBSERVE

O

PREDICT

OBSERVE

EXPLAIN

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EXPLAIN

E

  1. What happened to the appearance of the egg? 
  2. How did the egg’s shell act as a selectively permeable membrane?
  3. Use the idea of osmosis and the differences in solute concentration to explain the results of the test.

PREDICT

OBSERVE

EXPLAIN

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EGG-CELLENT OSMOSIS

PREDICT

OBSERVE

EXPLAIN

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GROWING GUMMIE

PREDICT

OBSERVE

EXPLAIN

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PREDICT

OBSERVE

EXPLAIN

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HYPOTONIC

WATER

HYPERTONIC SALT WATER

PREDICT

P

PREDICT

OBSERVE

EXPLAIN

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PREDICT

P

IF/THEN STATEMENT

IF…

If we put the gummy bear in the hypertonic salt water

THEN…

then it will ?????????

PREDICT

OBSERVE

EXPLAIN

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HYPOTONIC

WATER

HYPERTONIC CORNSYRUP

OBSERVE

O

PREDICT

OBSERVE

EXPLAIN

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HYPOTONIC

WATER

HYPERTONIC CORNSYRUP

EXPLAIN

E

PREDICT

OBSERVE

EXPLAIN

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EXPLAIN

E

  1. What happened to the appearance of the gummy bear?
  2. How did the gummy bear’s ‘skin’ act as a selectively permeable membrane?
  3. Use the idea of osmosis and the differences in solute concentration to explain the results of the test.

PREDICT

OBSERVE

EXPLAIN

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GROWING GUMMIE

PREDICT

OBSERVE

EXPLAIN

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  • Osmosis
  • Isotonic
  • Hypertonic
  • Hypotonic

ADD IT TO THE

W

WORD

W

WALL