To understand why cockroaches—and many other insects—can survive decapitation, it helps to understand why humans cannot, explains physiologist and biochemist Joseph Kunkel at the University of Massachusetts Amherst, who studies cockroach development.
Source: Scientific American
|Why Humans Can't Survive Decapitation?||Why Cockroaches Can Survive Decapitation?|
|Decapitation in humans results in blood loss and a drop in blood pressure hampering transport of oxygen and nutrition to vital tissues.||Cockroaches have open circulatory system with low blood pressure. They don't have a huge network of blood vessels like that of humans, or tiny capillaries. After you cut their heads off, very often their necks would seal off just by clotting. There's no uncontrolled bleeding.|
|A drop in blood pressure hampering transport of oxygen and nutrition to vital tissues.||Insect blood does not carry oxygen. The spiracles carry air directly to tissues through tracheae.|
|Humans breathe through their mouth or nose.||Cockroaches breathe through spiracles, located in each body segment.|
|The brain controls that breathing, so breathing would stop.||Their brain does not control this breathing. Insects have ganglia distributed within each body segment capable of performing the basic nervous functions responsible for reflexes.|
|The human body cannot eat without the head, ensuring a swift death from starvation should it survive the other ill effects of head loss.||Cockroaches are also poikilotherms, or cold-blooded, meaning they need much less food than humans do. An insect can survive for weeks on a meal they had one day.|
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