the circulatory system is like any mechanical system. The more work it does the more it needs maintenance, The body does this and the more things it is working on repairing at the same time the more time it takes to repair each one. High blood pressure stresses the circulatory system and wears it down over time thus needing more repairs than a circulatory system working under normal pressure. There are more complicated reasons for this but this is one that is easiest to explain in simple terms. Now go read a dictionary.
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