DIFFUSION OSMOSIS What does the prefix homo mean

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DIFFUSION / OSMOSIS

DIFFUSION / OSMOSIS

• What does the prefix ‘homo’ mean? • Same

• What does the prefix ‘homo’ mean? • Same

HOMEOSTASIS • Homeostasis (aka Homoeostasis): the tendency of a system to STAY THE SAME

HOMEOSTASIS • Homeostasis (aka Homoeostasis): the tendency of a system to STAY THE SAME • Our body is an example of a system

• There are two ways that homeostasis can be maintained: – Diffusion –

• There are two ways that homeostasis can be maintained: – Diffusion – Osmosis

OSMOSIS • Osmosis is the movement of high to low concentration. WATER from

OSMOSIS • Osmosis is the movement of high to low concentration. WATER from

• Membranes (barriers) can be permeable Permeable (def. ): allowing things (such as

• Membranes (barriers) can be permeable Permeable (def. ): allowing things (such as liquid or solids) to pass through

• What does the word ‘selective’ mean? *Think of charter schools that are

• What does the word ‘selective’ mean? *Think of charter schools that are described as selectively enrolled students So what does selective permeability mean?

SELECTIVE PERMEABILITY • Selective Permeability: a PARTIALLY selective membrane that allows only CERTAIN things

SELECTIVE PERMEABILITY • Selective Permeability: a PARTIALLY selective membrane that allows only CERTAIN things to go through

DIFFUSION • Diffusion is movement of solid, gases, and other substances molecules (solutes) from

DIFFUSION • Diffusion is movement of solid, gases, and other substances molecules (solutes) from high to low concentration.

PRACTICE/PREDICTION

PRACTICE/PREDICTION

3 TYPES OF CONCENTRATION • Hypertonic • Hypotonic • Isotonic • Hyper = More

3 TYPES OF CONCENTRATION • Hypertonic • Hypotonic • Isotonic • Hyper = More • Hypo = Less • Iso = Same

ISOTONIC SOLUTION concentration of solute outside of the cell is EQUAL to the concentration

ISOTONIC SOLUTION concentration of solute outside of the cell is EQUAL to the concentration of solute inside the cell. H 2 O Water Molecule Dissolved Molecule

HYPOTONIC SOLUTION Concentration of solute is LOWER (higher water concentration) outside of the cell

HYPOTONIC SOLUTION Concentration of solute is LOWER (higher water concentration) outside of the cell than the concentration of solute inside the cell. H 2 O Water Molecule Dissolved Molecule

• In a HYPOtonic solution - The cell swells because more water goes

• In a HYPOtonic solution - The cell swells because more water goes in the cell. Less solutes outside of the cell, high concentration of solutes in the cell, so water moves in.

HYPERTONIC SOLUTION Concentration of solute is HIGHER (water concentration is lower) outside of the

HYPERTONIC SOLUTION Concentration of solute is HIGHER (water concentration is lower) outside of the cell than the Concentration of solute inside of the cell H 2 O Water molecule Dissolved molecule

• In a HYPERtonic solution - The cell shrinks because water leaves the

• In a HYPERtonic solution - The cell shrinks because water leaves the cell. High concentration of solids on the outside of the cell, so the cell loses water and shrinks.

What type of solution is this Hypo -, Hyper- or Iso- tonic? Which way

What type of solution is this Hypo -, Hyper- or Iso- tonic? Which way will the water move?

Hypotonic Water moves INTO the cell

Hypotonic Water moves INTO the cell

What type of solution is this Hypo -, Hyper- or Iso- tonic? Which way

What type of solution is this Hypo -, Hyper- or Iso- tonic? Which way will the water move?

Isotonic Water moves at an EQUAL rate into and out ofthe cell

Isotonic Water moves at an EQUAL rate into and out ofthe cell

What type of solution is this Hypo -, Hyper- or Iso- tonic? Which way

What type of solution is this Hypo -, Hyper- or Iso- tonic? Which way will the water move?

Hypertonic Water moves OUT of the cell

Hypertonic Water moves OUT of the cell

water Cell stays the SAME Cell SWELLS Cell Shrinks

water Cell stays the SAME Cell SWELLS Cell Shrinks

ANIMAL CELL Isotonic Hypertonic PLANT CELL Isotonic Hypertonic

ANIMAL CELL Isotonic Hypertonic PLANT CELL Isotonic Hypertonic

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