Phenomena and Processes [G] » Metabolism [G03] » Biological Transport » Capillary Permeability
Phenomena and Processes [G] » Circulatory and Respiratory Physiological Phenomena [G09] » Cardiovascular Physiological Phenomena » Capillary Permeability
Description
The property of blood capillary ENDOTHELIUM that allows for the selective exchange of substances between the blood and surrounding tissues and through membranous barriers such as the BLOOD-AIR BARRIER; BLOOD-AQUEOUS BARRIER; BLOOD-BRAIN BARRIER; BLOOD-NERVE BARRIER; BLOOD-RETINAL BARRIER; and BLOOD-TESTIS BARRIER. Small lipid-soluble molecules such as carbon dioxide and oxygen move freely by diffusion. Water and water-soluble molecules cannot pass through the endothelial walls and are dependent on microscopic pores. These pores show narrow areas (TIGHT JUNCTIONS) which may limit large molecule movement. MeSH
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