• Cells of the immune system consistently destroy pathogens by essentially "eating" them.
  • Vesicles or other bodies in the cytoplasm move macromolecules or large particles across the plasma membrane.
  • There are two types of vesicle transport, endocytosis and exocytotic vesicles.
  • Both processes are active transport processes, requiring energy.
  • The plasma membrane folds over the substance and it becomes completely enclosed by the membrane.
  • At this point a membrane-bound sac (vesicle) pinches off and moves the substance into the cytosol.
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