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Unformatted text preview: Funnel Web Spiders, Atrax robustus • Symptoms o Generalized muscle spasms o Salivation o Hypertension • Venom greatly over stimulates muscle • Venom primarily affects primates: other mammals more resistant Japanese Puffer Fish • Tetrodotoxin; concentrated in gonads • Blocks nervous transmission • Symptoms: o Vomiting o Light headedness o Dizziness o Feelings of doom (you can imagine why) • An ascending paralysis; death can occur within 6-24 hours Other marine organisms store TTX • Harlequin frogs • Blue ring octopus Convergent evolution • Different structures independently evolved to produce same trait • Signature feature of evolution • Evolution a creative process; converges on the same solution for a problem...
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- Fall '08
- Spider, Spider bite, Toxin, Snake, muscle spasms, Venom