Understanding Extravascular Substances in Medicine

Extravascular refers to something that is outside of a vessel or bloodstream. In the context of medicine, it typically refers to substances or cells that are present in tissues or organs, but not within the blood vessels.

For example, if a patient has a condition where a certain medication is not being effectively delivered to their tissues due to poor blood flow, the doctor might describe the medication as "extravascular" because it is not being carried into the tissues by the bloodstream.

In contrast, intravascular refers to substances or cells that are present within the blood vessels, such as red blood cells, white blood cells, and platelets.

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