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Blood pressure isn't regulated by "chemical reactions" per se, but is regulated by a sort of "cooperative effort," to anthropomorphize the body, by the CNS and the endocrine system.

Under ideal conditions, i.e. devoid of disease processes, the CNS is stimulated, the endocrine system releases vasoconstrictor or vasodialator hormones and the smooth muscles in the blood vessel walls constrict or dialate accordingly.

Increased heart rate, as in when adrenaline is released, can immediately raise blood pressure because the heart is pumping faster/harder.

Plain old exercise can do the same thing.

The reactions are hormonal and neural. Blood vessels constrict and dialate responsively. Neurotransmitters also play a role.

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