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Movement of Substances Across the Plasma Membrane
3.2 The Movement of Substances Across thePlasma Membrane in Everyday Life
Movement of Substances Across the Plasma Membrane
Hypotonicsolutions
Hypertonicsolutions
Structure of theplasma membrane
Concentration ofsolutions
Activetransport
Passivetransport
Transportacross the
plasma membrane
Isotonicsolutions
Chapter 3: Movement of Substances Across the Plasma Membrane
Chapter3.2
Movement ofSubstances Across thePlasma Membrane in Everyday Life
Hypotonic
A solution with a lower solute concentration (higher waterconcentration than another solution)
Hypertonic
A solution with a higher solute concentration (lower waterconcentration than another solution)
Isotonic
Concentration of solute are equal (equal waterconcentration)
Chapter 3: Movement of Substances Across the Plasma Membrane
Hypotonic Solution Water enters the cell
Causing the cell to swell upand burst
This condition is known ashaemolysis
water enters
Isotonic Solution No change to the shape and size of the cell
Amount of water leaving = amount of water entering
water enterswater leavesby osmosis
Chapter3.2
Hypertonic Solution Water leaving the cell
Causing the cell to shrink andbecome crenated
water leavesby osmosis
Movement of SubstancesAcross the Plasma Membrane in Everyday Life
Chapter 3: Movement of Substances Across the Plasma Membrane
Chapter3.2
Hypotonic Solution Water enters the cell
Causing the cell to swell andbecomes turgid
The cell wall prevents the cellfrom bursting
water enters
Movement of SubstancesAcross the Plasma Membrane in Everyday Life
Chapter 3: Movement of Substances Across the Plasma Membrane
Chapter3.2
Isotonic Solution Amount of water leaving =
amount of water entering
The cell retains its normalsize
water enterswater leaves
Movement of SubstancesAcross the Plasma Membrane in Everyday Life
Chapter 3: Movement of Substances Across the Plasma Membrane
Hypertonic Solution Water leaves the cell
The cytoplasm shrinks awayfrom the cell wall
This phenomenon is calledplasmolysis
water leaves by osmosis