Refer to the figure below, showing how fatty acids self-assemble to form a bilayer membrane in water. 
The arrow indicates the polar head of a(n) fatty acid, which is _______, a term meaning water-loving.This portion of the fatty acid interacts with water molecules.
Definitions:
Dielectric Oil
A type of insulating oil often used to cool transformers.
Insulator
A material or device that resists the flow of electric current, used to prevent undesired current flow.
Cooling
The process of removing heat from an object or space, often to maintain a desired temperature.
Phase Current
The electric current flowing through one phase of a multi-phase system, like in three-phase electrical systems.
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