Definition for Transcytosis
From Biology Forums Dictionary
1) Transcytosis occurs as membrane-bound carriers selectively transport materials between one part of the cell and another in order to maintain unique environments on either side of the cell. Epithelial cells use transcytosis for immune defense, nutrient absorption, and plasma membrane biogenesis. Other cell types employ transcytosis as well, such as the endothelium and the endocrine system.
2) Transcytosis is the process by which various macromolecules are transported across the interior of a cell. Macromolecules are captured in vesicles on one side of the cell, drawn across the cell, and ejected on the other side.