How does caffeine effect the blood pressure and pulse rate?

I know that caffeine cause an increase in blood pressure and pulse rate, however, how and why does it do that? I know that it is a mild stimulant but why does it increase blood pressure and pulse rate? I am desperate to find out. If u own any information whatsoever, please provide it for me.

Answers:
thats what stimulates do! they stimulate your system. thats why they telephone them that.

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