• The cell membrane is selectively permeable, allowing only certain substances to pass through.
  • Diffusion is the movement of molecules from an area of high concentration to an area with a lower concentration.
  • Active transport is when the cell uses energy to pull in or pump out certain molecules and ions.
  • Vesicle transport is in which large molecules are moved across the membrane in bubble-like sacks that are made from pieces of the membrane.
  • In this way, cell membranes help maintain a state of homeostasis within cells (and tissues, organs, and organ systems)
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