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Blood pressure is the pressure exerted by the blood on the walls of the arteries. Interestingly, cockroaches have open type of Blood vascular system,ie. Blood don't flow in vessels. So there are no arteries and veins and hence no blood pressure
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Because cockroach do not have close blood system they have open blood vascular system. so, the blood don't flow by arteries and veins therefore cockroach don't have blood pressure.
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