Paracellular transport
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Paracellular transport refers to the transfer of substances between cells of an epithelium.[1][1]
It is in contrast to "transcellular transport", where the substancees travel through the cell, passing through both the apical membrane and basolateral membrane.[1][1][1]
The distinction is in particular significance in renal physiology. Transcellular transport is more likely to involve energy expenditure than paracellular transport.[1]
Capillaries of Blood Brain Barrier have transcellular transport only in contrast with normal capillaries which have both - transcellular and paracellular transport. This is due to the presence of tight junctions in Blood Brain Barrier and Astrocytes that surround the capillaries.
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