How are phospholipids oriented in the plasma membrane and what role does this orientation play in the structure and function of the membrane?

Phospholipids in the plasma membrane are arranged in a bilayer, with the hydrophilic heads facing outward towards the watery environment and the hydrophobic tails facing inward. This orientation helps maintain the integrity and fluidity of the membrane, allowing it to selectively control the movement of substances in and out of the cell.