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Spiders can generate pressures up to eight times their resting level to extend their legs, [24] and jumping spiders can jump up to 50 times their own length by suddenly increasing the blood pressure in the third or fourth pair of legs. [25]
Spiders, like most arthropods, have an open circulatory system, i.e., they do not have true blood, or the veins which transport it. Rather, their bodies are filled with haemolymph , which is pumped through arteries by a heart into spaces called sinuses surrounding their internal organs .
Spiders can generate pressures up to eight times their resting level to extend their legs, [39] and jumping spiders can jump up to 50 times their own length by suddenly increasing the blood pressure in the third or fourth pair of legs. [13]
A spider angioma or spider naevus (plural: spider naevi), also nevus araneus, is a type of telangiectasis [2] (swollen, spider-like blood vessels on the skin) found slightly beneath the skin's surface, often containing a central red spot and deep reddish extensions (see Blood color) which radiate outwards like a spider's web or a spider's legs.
The venom directly affects nerves leading to the unusual feature of severe sweating, which may be regional (e.g. one leg). Changes in adrenaline can lead to mild increase in blood pressure and pulse. Non-specific features of latrodectism include headache, nausea, vomiting and feeling ill and weak.
Along with other members of the genus, they are often referred to as Brazilian wandering spiders. [ 2 ] Its bite can cause severe symptoms, including increased pulse, blood pressure, and respiratory rate; extraordinary pain; penile erection that lasts for several hours ; and, in several documented cases , death.
The atracotoxins of Australian funnel-web spiders work by opening sodium channels, causing excessive neural activity including strange sensations (paresthesias), muscle contractions, unstable blood pressure (hypertension or hypotension). The venom may cause fluid to accumulate in the lungs (pulmonary edema) that can be fatal.
Hemolymph, or haemolymph, is a fluid, analogous to the blood in vertebrates, that circulates in the interior of the arthropod (invertebrate) body, remaining in direct contact with the animal's tissues.
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