It's true, cockroaches do not need a head to survive. By comparison, and from a purely biological point of view, we humans use our heads for three functions: (a) we breathe through our nose and mouth, and that breathing is controlled by our brain (though we could use a respirator). (b) The loss of our head would cause extreme blood loss which, in turn, would cause insufficient blood pressure – required to transport oxygen and nutrients to our bodies. And (c) we eat with our mouths, and would starve rather quickly. Contrast this with the cockroach: (a) it breaths through spiracles all over its body. The brain does not control this function. (b) Insects do not have mammalian blood pressure, and would not ‘bleed out’. And (c) as a cold blooded animal a single meal can, if the temperature is cool enough, last a whole month. Other than the danger of infection, a headless cockroach can, in fact, survive for quite some time. --
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