Magali’s doctor tells her the decongestant she has been taking for her cold has affected her blood pressure. What explains the relationship between this type of medicine and hypertension?

Many decongestants constrict (narrow) blood vessels to reduce swelling in the nasal passages. Narrower vessels make it harder for blood to flow, which can raise blood pressure and contribute to hypertension. Therefore, the correct choice is A: a decongestant causes blood vessels to narrow, increasing blood pressure.

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