Blood pressure would decrease
hair growth
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Arteries and blood vessels.
When muscles are tensed, they can increase blood pressure. Fighter pilots take advantage of this by tensing their gut muscles to avoid blacking out at high-G conditions.
It'll Increase your blood pressure because the blood is being rushed to the area where your flexing, which causes your blood pressure to rise.
Blood pressure is generated by the heart. When the heart muscles contract, they create pressure to push blood around the circulatory system.
Blood flow can be affected by such factors as clots and blood pressure which are in turn affected by obesity and genetics.
Blood pressure drops as dilation increases. This occurs because of decrease resistance.
Smooth muscles constrict veins when blood pressure suddenly drops. These types of muscles are the non striated, involuntary muscles found in blood vessels, veins, arteries, the uterus, the bladder, and reproductive tracts.
Hypertonic muscles usually have trigger points that refer pain to another related area of the body. The treatment would include static pressure on the trigger points, sometimes called ischemic pressure, until they disperse and allow blood flow to return to the affected tissues. The overall affect would be to relax the muscles.
I can tell you that high blood pressure, if it is not brought under control, can cause the kidneys to fail completely.