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Osmosis (The Diffusion of water molecules) (Partially permeable membrane…
Osmosis (The Diffusion of water molecules)
"It's not actually difficult. It's quite straight forward."
Mitrocondria
Carry out
"Aerobic Respiration"
Using
"Oxygen"
To release energy from
"Glucose"
Greater concentration of oxygen outside the cell than inside the cell.
A
"Concentration Gradient."
Oxygen Molecules
Move around randomly.
More Oxygen molecules outside the cell
Great chance that
"Oxygen"
will move in.
It will diffuse into the cell.
Low chance that
"Oxygen"
will move out.
Osmosis Definition
Diffusion of water
from a
"dilute"
to a "more concentrated solution."
through a
"partially permeable membrane."
allows
"Water molecules"
through.
not all molecules through.
Osmosis definition is worth learning as it has come up in the exam as a
"3 mark"
question.
Partially permeable membrane (Cell membrane)
Left hand side
Dilute solution
a lot of water molecules
Right hand side
Concentrated solution
fewer water molecules and dissolved sugars
Water molecules on
"both sides"
of the membrane.
Net movement of water molecules from the left, (dilute to concentrated)
"Cells"
Contain lots of
"Dissolved molecules."
The inside of cells are relatively concentrated
If in pure water...
It move into the cell by
"Osmosis."
The cell could burst
e.g. an Animal Cell
Plant cell has a cell wall
Protected from bursting
If we place a cell in a concentrated solution....
the water will move out of the cell through
"Osmosis."
If it's an
"Animal Cell"
the cell will shrink.
Sports Drinks
Mainly used by
"athletes"
during exercise.
contain...
"
water"
"ions"
e.g. "Na+" (Sodium)
to replace those lost in sweat.
"Sugars"
To replace those used in
"Respiration"
to generate
"Energy"
"Diffusion"
Movement of particles
higher concentration of particles move to the lower concentration.
