parietal (lines cavity)
vs
visceral (covers organs)
​serous membranes:
 pleura   peritoneum    pericardium

  exocytosis

  alveolar = acinar

     Histology: Membranes

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  Histology: Exocrine Glands

  method of secretion

 3
 2
 4
 1

  structural classification

     type of secretion