how does MRI contrast taste metallic even though it’s not administered orally?

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how does MRI contrast taste metallic even though it’s not administered orally?

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taste buds are alive

cells that are alive require blood

the contrast is in your blood

edit – this triggered a spam filter evidently so a less “like I’m 5” explanation:

he chemical substance responsible for the taste gets inn the mouth and comes into contact with a nerve cell. It activates the cell by changing specific proteins in the wall of the sensory cell. This change causes the sensory cell to transmit messenger substances, which in turn activate further nerve cells. These nerve cells then pass information for a particular perception of flavor on to the brain.

the nerve cell doesn’t really care how it comes into contact with the substance, being in the bloodstream can work, also some things cause taste and small nerve cells to mistrigger so what you are tasting may be different if you did put it in your mouth.