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