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Wednesday 14 June 2017


Definition: The secretion is a function.

Secretion is the movement of material from one point to another, e.g. secreted chemical substance from a cell or gland.


- exocrine secretion

- endocrine secretion

Cell secretion

The classical mechanism of cellular secretion is via secretory portals at the cell plasma membrane called porosomes.

Porosomes are permanent cup-shaped lipoprotein structure at the cell plasma membrane, where secretory vesicles transiently dock and fuse to release intra-vesicular contents from the cell.


In contrast, excretion, is the removal of certain substances or waste products from a cell or organism.