Vascular permeability
Vascular Permeability
Vascular permeability (/væˈskjʊlər pɜːrmiəˈbɪlɪti/), also known as capillary permeability, refers to the capacity of the blood vessels' walls to allow for the passage of small molecules or cells into and out of the bloodstream. This process is vital for the exchange of nutrients and waste products between the blood and the body's tissues.
Etymology
The term "vascular permeability" is derived from the Latin vasculum, meaning "small vessel", and the Latin permeabilis, meaning "passable".
Mechanism
Vascular permeability is regulated by the endothelial cells that line the interior surface of blood vessels. These cells form a semi-permeable barrier that allows certain substances to pass through while blocking others. The permeability of these cells can be influenced by various factors, including inflammation, hypoxia, and certain hormones.
Related Terms
- Endothelial cells: The cells that line the interior surface of blood vessels.
- Inflammation: A biological response to harmful stimuli, such as pathogens, damaged cells, or irritants.
- Hypoxia: A condition in which the body or a region of the body is deprived of adequate oxygen supply.
- Hormones: Chemical messengers that are secreted directly into the blood, which carries them to organs and tissues of the body to exert their functions.
See Also
External links
- Medical encyclopedia article on Vascular permeability
- Wikipedia's article - Vascular permeability
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