Bellwork
1. What is the cell membrane made of?
2. What two words describe the two
parts of a phospholipid?
3. What macromolecules are in the
membrane?
4. What are the tails of the
phospholipids made of?
5. Do you think the membrane acts
more like a solid or more like a liquid?
How Stuff Gets
Across the Membrane
Membrane Transport Animation
http://www.youtube.com/watch?v=prfMUwjobo8
How Stuff Gets Across the Membrane
passive transport - moving down the
concentration gradient (high to low)
which uses no energy
How Stuff Gets Across the Membrane
passive transport - moving down the
concentration gradient (high to low)
which uses no energy
•
diffusion = directly through the
membrane (gases mostly and H2O)
How Stuff Gets Across the Membrane
passive transport - moving down the
concentration gradient (high to low)
which uses no energy
•
diffusion = directly through the
membrane (gases mostly and H2O)
•
facilitated diffusion = through a
transport protein
How Stuff Gets Across the Membrane
passive transport - moving down the
concentration gradient (high to low)
which uses no energy
•
diffusion = directly through the
membrane (gases mostly and H2O)
•
facilitated diffusion = through a
transport protein
•
osmosis = diffusion of water across
the membrane
How Stuff Gets Across the Membrane
active transport - moving up the
concentration gradient (low to high)
which requires energy from ATP
How Stuff Gets Across the Membrane
active transport - moving up the
concentration gradient (low to high)
which requires energy from ATP
•
antiport = materials are moved into
across in opposite directions (in and
out of the cell) at the same time
How Stuff Gets Across the Membrane
active transport - moving up the
concentration gradient (low to high)
which requires energy from ATP
•
antiport = materials are moved into
across in opposite directions (in and
out of the cell) at the same time
•
cotransport = materials are moved
across at the same time
How Stuff Gets Across the Membrane
active transport:
•
exocytosis = vesicles fuse with the cell
membrane and release materials out
How Stuff Gets Across the Membrane
active transport:
•
exocytosis = vesicles fuse with the cell
membrane and release materials out
•
endocytosis = the membrane pinches
in to form a vesicle