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The seven segments of a spider's legs make them much more flexible than human legs, which only have two segments. Like humans, spiders have muscles that bend the legs closer to the body. However, spiders do not have muscles that move the legs away from the body. Each time a spider needs to stretch a leg back out, it must pump fluid (haemolymph) into that leg. Then, to bend the leg back, pressure is relaxed and the fluid flows out of the leg as the muscles do their work.[/quote]
Źródło: [url]http://homepage.ntlworld.com/spydawebb/anatomy.html[/url]
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The seven segments of a spider's legs make them much more flexible than human legs, which only have two segments. Like humans, spiders have muscles that bend the legs closer to the body. However, spiders do not have muscles that move the legs away from the body. Each time a spider needs to stretch a leg back out, it must pump fluid (haemolymph) into that leg. Then, to bend the leg back, pressure is relaxed and the fluid flows out of the leg as the muscles do their work.[/quote]
Źródło: [url]http://homepage.ntlworld.com/spydawebb/anatomy.html[/url]
...więcej dla zalogowanych. Zaloguj się lub Zarejestruj się :)