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cell membranes composed of two layers of phospholipids, with the tails pointed inwards towards each other, and the heads facing outward
transport proteins helping ions and polar molecules to diffuse through the bilayer
channel proteins (pores)
tunnels that open for ions and polar molecules to pass through the cell membrane
the solute has high concentration, the water has low, water moves out of the cell
the solute and water have an equal concentration to the cell's cytoplasm, water moves into and out of the cell at equal rates
colllect excess water in unicellular eukaryotes and force the water out of the cell
a carrier protein that uses ATP to actively transport 3 sodium ions out of a cell, and 2 potassium ions into a cell
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