A cockroach can live without a head a few days. And the head without too cockroach

Decapitation (decapitation) in humans leads to the loss of blood and blood pressure drop, which in turn gives the delivery of oxygen and nutrients to vital organs. In addition, a person breathes through the mouth or nose, and this vital function monitors the brain, respectively, after decapitation breathing stops.

In order that the blood could go through an extensive network of human blood vessels, particularly through the finest capillaries, the pressure must be maintained at a certain level. In arthropods the circulatory system is organized differently: it is not so extensive, it lacks fine capillaries, which allows pressure to be significantly lower.

"When you cut the cockroach's head, neck vessels are clogged clotted blood - said Kunkel - and no fatal bleeding does not happen».

Furthermore, these hardy creatures breathe through spiracles - tiny holes in each body segment. Cockroach's brain does not control breathing and the oxygen carried by the blood to the body; air flows to the tissues directly from the spiracles through the tubes (trachea).

Besides the cockroaches - Being poikilothermic, t. E. Cold-blooded. Consequently, they do not spend energy to maintain a constant body temperature, and therefore can be satisfied with much less food than humans. After eating once they are able to live for weeks after that.

"If they will not attack any predator, they will just sit quietly and motionless," - says Kunkel.

Cockroaches have in each segment of the body ganglia - clusters of nerve tissue that can perform basic reflex nerve function. And without the body of the insect brain can function at the level of simple reactions. It can get up to respond to touch and move.

Lonely head can also continue to operate and move his mustache still for several hours. If it's cool, it will last even longer.

Decapitation cockroach someone will seem creepy occupation, but researchers have conducted many experiments on the bodies of these insects to answer some serious questions. Decapitation robs the body of the arthropod receipt hormones that control the maturation and stand out from the glands, which are located in their heads. This discovery allows scientists to study the metamorphosis and reproduction in insects, and reveals the work of neurons.

Source: www.pochemy.net

via factroom.ru