What is a traveling foreign substance in the bloodstream known as?

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A traveling foreign substance in the bloodstream is known as an embolus. This term specifically refers to any material, which can include blood clots, air bubbles, or fat droplets, that travels through the bloodstream and can block a blood vessel. The consequences of an embolus can be serious, leading to conditions such as stroke or pulmonary embolism, depending on where the obstruction occurs.

The other terms do not accurately describe a foreign substance in transit within the bloodstream. A thrombus refers to a blood clot that forms in a blood vessel and remains attached to the site of formation, rather than traveling. Pneumonia is an inflammatory condition of the lung, which is unrelated to substances in the bloodstream, while an aneurysm is an abnormal bulging or dilation of a blood vessel wall. These terms highlight different medical phenomena that are distinct from the concept of an embolus.