_____ are believed to result from narrowing of the blood vessels followed by expansion of those same vessels.

Name: _____ are believed to result from narrowing of the blood vessels followed by expansion of those same vessels.
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Migraine headaches are believed to result from the narrowing (vasoconstriction) and subsequent expansion (vasodilation) of blood vessels in the brain. This process is thought to contribute to the pain and other symptoms associated with migraines.

_____ Are Believed to Result from Narrowing of the Blood