A danger kind of poison is the kind that effects you once you've been bitten by the black widow spider. When you're first bitten by the black widow spider, you feel something that's like a pin prick. Sometime within the next hour, the poison starts to spread from the bite area through out the rest of the body, and you start to feel a dull kind of pain. You start to suffer from many different side effects such as:
-Anxiety
-Difficulty breathing
-Headache
-High blood pressure
-Muscle weakness
-Nausea
-seizures
The venom works by immobilizing the muscles in your body. They use it so that their prey can't get away. The venom paralyzes the nervous system and and that's how it hurts people so badly. When the poison enters the body it targets the acetylcholine receptors, potassium channels and calcium channels.
http://www.calpoison.org/public/spiders.html
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