Final answer:
Lipids with polar and nonpolar ends are said to be amphipathic.
Step-by-step explanation:
Amphipathic
The lipids in cell membranes, such as phospholipids, have polar heads that face towards water and nonpolar fatty acid tails that face towards other fatty acid tails. These lipids are called amphipathic because they have both polar (hydrophilic) and nonpolar (hydrophobic) parts.