Transcript Membrane Transport - Miss Galegar's Biology Class

Membrane Transport
Diffusion
• With concentration
gradient
– Unequal amounts of
particles
• Movement of particles
– From high
– To Low
Dynamic Equilibrium
• Equal
concentrations are
reached
– Not the same
volumes
• Continued
•
movement across
the membrane
Not gain or loss
Osmosis
• Movement of water
• From high
to low
• Across a
selectively
permeable
membrane
Isotonic Solutions
• Iso- equal
• No change in concentrations
– Water still moves
– Same amount moves in as moves out
• Both sides of membrane are the same
Hypotonic Solution
• Hypo- under
• Out side of cell
– Less dissolved substance
– More water
• Water moves into cell
Hypertonic Solution
• Hyper- Over
• Out side of cell
– More dissolved substance
– Less water
• Water moves out of cell
Passive Transport
• Cell uses no energy
• From high to low
Plasma
membrane
Concentration
gradient
Facilitated Diffusion
• Type of passive
•
transport
Use transport
proteins
– Channel proteins
– Carrier proteins
• Changes shape
• From high to low
Active Transport
• Cell uses energy
• Against concentration
gradient
– From low to high
• Carrier Proteins
– Molecule binds with carrier
protein
– Energy then used to
change shape
– Molecule released on other
side
– Carrier protein returns to
original shape
Large Particle Transport
• Not through
•
•
membrane
Requires energy
Exocytosis- out
Large Particle Transport
• Endocytosis- in
Types of Endocytosis
Pinocytosis: liquid
Phagocytosis: Solid
What about freshwater/saltwater
cells?
Membrane Transport Bioflix
At my website you can find this and the link
below has a bunch of tutorials, videos,
etc.
• Transport in action