Controls what enters and what exits a cell.
Made of Lipids and Proteins
Same amount inside & outside
Cell stays the same
More concentration on the outside,causes the cell to shrink
Less concentration on the outside ,causes the cell to swell
Against the gradient
Works against gradient & requires ATP
Controls what enters the cell
Controls what exit the cell
Low to high
No ATP used
With the gradient
Molecules moving from High to Low.
Uses Protein Channel
Movement of water. High to Low.