Gap Fill - Centipedes - Level 5


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   animals      careful      cells      creatures      deadly      death      exactly      expert      hearts      highly      legs      long      muscular      odd      painful      punch      rapid      rarely      simultaneously      weeks  
We should be very of centipedes. The venom from these packs a serious . It can cause paralysis and in small animals. A centipede's sting is poisonous and can kill humans. Scientists have discovered a toxin in the venom that can stop the of animals that are 15 times bigger than a centipede. The toxin in the Chinese red-headed centipede, which can grow to be eight inches , blocks potassium from moving in and out of . This prevents an animal's brain from sending signals to the heart to beat, which leads to a death.

The venom kills humans, but it can be unbelievably . It also causes swelling for up to two . Researcher Shilong Yang, an in toxins at China's Kunming Institute of Zoology, said: "The centipede's venom has evolved to disrupt cardiovascular, respiratory, and nervous systems." This has not been found in other poisonous . Despite their name, centipedes do not have 100 legs. They have a number of , ranging from 30 to 354. Centipedes always have an number of pairs of legs. This means no centipede has 100 legs.

Try the Centipedes - Level 6 gap fill.

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