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Cell Membrane Transportation
The membrane is the structure that regulates what enters and leaves the cell.
Some particles can flow in and out of a cell, but other things need the membrane to reshape itself to enter or exit the cell– a process that requires energy.
Diffusion
will diffuse in both directions across the membrane so it will end up with about equal amounts on the outside and on the inside.
The cell does not need to use any energy for diffusion to occur. Substances that are diffusing move from an area of higher concentration to an area of lower concentration just by their own random motion.
Is energy necessary for this mode of transportation?
Facillitated Diffusion
a protein channel is needed to change the shape of the cell in order to allow bigger materials to pass through
No. The cell does not need to use any energy for facilitated diffusion to occur. Substances are diffusing through a protein channel from an area of higher concentration to an area of lower concentration just by their own random motion.
Works by using a protein gate that changes shape to transport materials in and out the cell.
Is Energy needed?
Endocytosis
Endocytosis
works by allowing materials to come inside of the cell (in a vesicle)
Endocytosis only takes in materials from the outside of the cell to the inside of the cell. Only moves in one direction
Yes. Endocytosis requires that the cell rearrange its cell membrane to take in materials, which takes energy to occur.
Exocytosis works by having
Exocytosis
materials start in a vesicle inside the cell. To release the large materials from the cell, the vesicle fuses with the cell membrane releasing the large proteins from inside the vesicle.
Only moves things out the cell
Yes. Exocytosis requires that the cell rearrange its cell membrane to excrete materials, which takes energy to occur.