• The plasma membrane contains molecules other than phospholipids, primarily other lipids and proteins.
  • Many of the proteins in the plasma membrane assist other substances in crossing the membrane.
  • The plasma membrane may have extensions, such as whip-like flagella or brush-like cilia.
  • For example, the cilia on human lung cells sweep foreign particles and mucus toward the mouth and nose.
  • It is the semipermeable plasma membrane that determines what can enter and leave the cell.
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