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Tickborne Lyme disease and Rocky Mountain spotted fever present similar symptoms, so it's important to know the differences between the two. Advanced Search International Search. Here are ten of the most fascinating cockroach facts: 1. For a cockroach that loses its head, the blood just clots at the neck.
No nose, no mouth, and no need for a brain to regulate your breathing means that you can breathe all you want to without a head. Cockroaches do in fact have brains. And they use them. In addition to brains, they have nerve tissues that control reflexes throughout their bodies, and these are distributed within each body segment. Plus, the roach brain does not control this breathing and blood does not carry oxygen throughout the body.
Rather, the spiracles pipe air directly to tissues through a set of tubes called tracheae. Cockroaches are also poikilotherms, or cold-blooded, meaning they need much less food than humans do. Then they're dead. A couple lasted for several weeks in a jar. Insects have clumps of ganglia—nerve tissue agglomerations—distributed within each body segment capable of performing the basic nervous functions responsible for reflexes, "so without the brain, the body can still function in terms of very simple reactions," Tipping says.
And it is not just the body that can survive decapitation; the lonely head can thrive, too, waving its antennae back and forth for several hours until it runs out of steam, Kunkel says. If given nutrients and refrigerated, a roach head can last even longer.
Still, in roaches, "the body provides a huge amount of sensory information to the head and the brain cannot function normally when denied these inputs," explains neuroscientist Nick Strausfeld of the University of Arizona, who specializes in arthropod learning, memory and brain evolution.
For instance, although cockroaches have a fantastic memory, "when we've tried to teach them when they had bits of them missing, it's hopeless. Kunkel of the University of Massachusetts Amherst, who studies cockroach development. First, decapitation in humans results in blood loss and a drop in blood pressure, hampering transport of oxygen and nutrition to vital tissues.
In addition, humans breathe through their mouth or nose, and the brain controls that critical function, so breathing would stop. Moreover, the human body cannot eat without the head, ensuring certain death from starvation should one survive the other ill effects of head loss. Cockroaches do not have the same kind of circulatory system as people. For blood to make its way through the vast network of human blood vessels, and especially through the tiny capillaries, a fair amount of pressure must be maintained.
The roach vascular system is much less extensive and lacks tiny capillaries, Kunkel notes, so pressure can be significantly lower. Moreover, the hardy vermin breathe through spiracles, or little holes in each body segment.
The roach brain does not control this breathing, and blood does not carry oxygen throughout the body. Rather the spiracles pipe air directly to tissues through a set of tubes called tracheae.
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