Transcript Unit 2 “Cells & Viruses”

Unit 3
“Cell Transport”
Vocabulary Review
10 Words
A solution that has a lower
concentration of solute
outside than inside the
cell, causing water to flow
into the cell by osmosis.
* Swell or Explode*
Hypotonic
A solution that has a lower
concentration of solute
outside than inside the
cell, causing water to flow
into the cell by osmosis.
* Swell or Explode*
Regulation of an
organism’s internal
environment to
maintain conditions
needed for life.
* Stable/balanced*
Homeostasis
Regulation of an
organism’s internal
environment to
maintain conditions
needed for life.
* Stable/balanced*
Diffusion of water
across a
selectively
permeable
membrane.
Osmosis
Diffusion of water
across a
selectively
permeable
membrane.
Energy-requiring
process by which
substances move
across the plasma
membrane against a
concentration gradient.
* Walking up a hill*
Active
Transport
Energy-requiring
process by which
substances move
across the plasma
membrane against a
concentration gradient.
* Walking up a hill*
Flexible, selectively
permeable
boundary that helps
control what enters
and leaves the cell.
Plasma (Cell)
Membrane
Flexible, selectively
permeable
boundary that helps
control what enters
and leaves the cell.
Net movement of
particles from an
area of higher
concentration to an
area of lower
concentration.
Diffusion
Net movement of
particles from an
area of higher
concentration to an
area of lower
concentration.
Passive transport of ions
and small molecules
across the plasma
(cell) membrane by
transport proteins.
*No Energy*
Facilitated
Diffusion
Passive transport of ions
and small molecules
across the plasma
(cell) membrane by
transport proteins.
*No Energy*
A solution with the same
concentration of water
and solutes as inside a
cell, resulting in the cell
retaining its normal shape
because there is no net
movement of water.
Isotonic
A solution with the same
concentration of water
and solutes as inside a
cell, resulting in the cell
retaining its normal shape
because there is no net
movement of water.
A solution that has a
higher concentration of
solute outside than
inside a cell, causing
water to leave the cell
by osmosis.
* Shrivel or Shrink*
Hypertonic
A solution that has a
higher concentration of
solute outside than
inside a cell, causing
water to leave the cell
by osmosis.
* Shrivel or Shrink*
A separation between
areas that have
different solute
concentrations,
sometimes separated
by a barrier like a
membrane
Concentration
Gradient
A separation between
areas that have
different solute
concentrations,
sometimes separated
by a barrier like a
membrane
The End