Black widow spider

Black Widow Spider

Black widow spiders (black widow spider) is the scientific name Latrodectus. mactans a small spider Found in many countries It is abundant in North America and south-west of Australia. The name reflects the behavior of female spider eats the male spider after mating. Black widow spiders like to live in the absence of light, no wind, such as a fence or in a pile of leaves and like nocturnal.
Only the female black widow spiders only bite humans. The male is smaller and the jaw is not strong enough.
Toxicity of black widow spider venom called latrotoxin as a main effect on the nervous system (neurotoxin) is toxic to neurons tip gap. The calcium (Ca2 +) influx into the neurons, a mechanism for the release of neurotransmitters. (Neurotransmitter) causes time and continuous transmission of nerve sensitivity. Result in muscle spasms and paralysis. The cause of death is caused by diaphragmatic muscle and cardiac muscle function and aggravate the toxic dose is received. This poison is stronger than most of snake venom. Onset is usually after the bite, about 20 minutes to 1 hour.