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RE: What gives cockroaches the ability to survive without their heads, and why can't humans do the same?
This is an informative article i must say.
Unlike humans, cockroaches do not need much amount of hemolymph to survive. In fact, the body cavity is reduced to minimize the amount of hemolymph in the general circulation.
Also, when you cut off the head of cockroach, their neck seals off almost immediately just by clotting. Hence there is no uncontrollable bleeding (or loss of hemolyph as the case may be).
nice ;)
Thanks brother.