diffusion / osmosis. what does the prefix ‘homo’ mean? same
DESCRIPTION
HOMEOSTASIS Homeostasis (aka Homoeostasis): the tendency of a system to STAY THE SAME Our body is an example of a systemTRANSCRIPT
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DIFFUSION / OSMOSIS
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•What does the prefix ‘homo’ mean?
•Same
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HOMEOSTASIS•Homeostasis (aka Homoeostasis): the
tendency of a system to STAY THE SAME
•Our body is an example of a system
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• There are two ways that homeostasis can be maintained:– Diffusion– Osmosis
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OSMOSIS
• Osmosis is the movement of WATER from high to low concentration.
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• Membranes (barriers) can be permeable Permeable (def.): allowing things (such as liquid or solids) to pass through
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• What does the word ‘selective’ mean?
*Think of charter schools that are described as selectively enrolled students
So what does selective permeability mean?
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SELECTIVE PERMEABILITY
•Selective Permeability: a PARTIALLY selective membrane that allows only CERTAIN things to go through
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DIFFUSION • Diffusion is movement of solid, gases, and
other substances molecules (solutes) from high to low concentration.
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PRACTICE/PREDICTION
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3 TYPES OF CONCENTRATION • Hypertonic
• Hypotonic
• Isotonic
• Hyper = More
• Hypo = Less
• Iso = Same
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concentration of solute outside of
the cell is EQUAL to the
concentration of solute inside the
cell.
H2O
H2O
Water MoleculeDissolved Molecule
ISOTONIC SOLUTION
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HYPOTONIC SOLUTIONConcentration of solute is LOWER
(higher water concentration)
outside of the cell than the
concentration of solute inside the cell.
H2O
H2O
Water MoleculeDissolved Molecule
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• 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.
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HYPERTONIC SOLUTION
Concentration of solute is HIGHER
(water concentration is lower) outside of
the cell than theConcentration of solute inside of the
cell
H2O
H2O
Water moleculeDissolved molecule
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• 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.
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What type of solution is this Hypo-, Hyper- or Iso- tonic?
Which way will the water move?
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Hypotonic
Water moves INTO the cell
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What type of solution is this Hypo-, Hyper- or Iso- tonic?
Which way will the water move?
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Isotonic
Water moves at an EQUAL rate into and out ofthe cell
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What type of solution is this Hypo-, Hyper- or Iso- tonic?
Which way will the water move?
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Hypertonic
Water moves OUT of the cell
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water
water
waterwater
Cell SWELLS
Cell stays the SAME
Cell Shrinks
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ANIMAL CELL
PLANT CELL
Isotonic Hypotonic Hypertonic
Isotonic Hypotonic Hypertonic