Brainstorm: How can molecules move against their

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Transcript Brainstorm: How can molecules move against their

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cell membrane
concentration
diffusion
osmosis
equilibrium
active transport
passive transport
Cell Membrane
• Controls what enters and exits the cell
• Lipid bilayer
– Hydrophilic heads (water loving) are on the outsides of
the membrane
– Hydrophobic tails (water fearing) are in the inside of
the membrane
– Have protein channels embedded through out the
membrane that act like doors to let large molecules in
and out
Concentration
Not what this means in science
This is what we want
The amount of a substance in an area
DIFFUSION: the
movement of molecules
from an area of high to low
concentration – DOES
NOT REQUIRE ENERGY
Passive Transport
• Does osmosis
or diffusion
require
energy?
• No, molecules
move along a
concentration
gradient.
Facilitated Diffusion
• Facilitated
Diffusionmolecules move
down a
concentration
gradient with the
aid of special
proteins.
Osmosis
• The movement of
water across a
semipermeable
membrane like the cell
membrane.
• Water wants to
balance out each side
of the membrane
Equilibrium – everything is balanced
3 types of solutions
• Iso – equal
• Hypo – below
• Hyper - above
• Remember water
wants to equal
everything out so it
will move in the
direction there is
less water and
more solutes.
Solutions
Solutions in Plants
Active Transport
• Requires
Energy.
• ATP (form of
energy made by
mitochondria).
• Moves against
the
concentration
gradient.
Endocytosis
Transporting
material
into a cell
by the in
folding of a
membrane.
2 Types of Endocytosis
• PhagocytosisSolid particles are
ingested into the
cell.
• Pinocytosis –
liquids taken into
the cell.
Exocytosis
• Moves
materials out
of the cell
Summary
1.What is Diffusion?
2.What is Osmosis?
3.What is Active Transport?
4.What is Passive Transport?