The phospholipids of a cellular membrane will have their ____ ends facing each other (inside) and their ____ ends facing away from each other (outside).

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Phospholipids have hydrophilic (water-attracting) heads and hydrophobic (water-repelling) tails. In a cellular membrane, the hydrophilic heads face outward towards the water inside and outside the cell, while the hydrophobic tails face inward, away from the water.

The Phospholipids of a Cellular Membrane Will Have Their ____