All venom acts different on the system it is “applied” in to.
One may work in a human quicker or slower but that makes it difficult to compare which is stronger. In my opinion the Boomslang has the most concentrated venom of all snakes in the world. It takes a micro amount to kill a human but this usually will take up to 72 hours were a venomous sea snake will use a considerably more venom in comparison but will take maybe less than an hour depending.
LD50 ratings is very important if you or I were a mouse as the human system is considerably different. (That is another story)
Types of snakes and venom properties
Snake venom is, highly modified saliva, and is produced by modified saliva glands. It is simply a cocktail of hundreds, sometimes thousands, of different proteins and enzymes. Many of these proteins are harmless but a percentage of them are toxins.
The makeup of these toxins varies widely from species to species. This complexity accounts for the widely differing effects of snakebite as the proteins that can kill or immobilise prey vary in their effect and the percentages in which they are present.
The Four Main Venom Properties
HAEMOTOXIN, NEUROTOXIN, CYTOTOXIN, MYOTOXIC
Haemotoxic (Blood destroying), which means that they primarily affect the blood. Haemotoxic venom act principally on the blood-clotting agent producing thrombosis or as anti-coagulant, reducing the clotting power of the blood, causing profuse bleeding hematoxic venom destroys tissue and is very painful. (Examples of these types of snakes is the Boomslang)
Neurotoxic (Nerve Destroying) venoms attack the central nervous system. These may cause almost no pain, but shut down the respiratory systems and interfere with heart functions. (Examples of these types of snakes is the cobra)
Cytotoxic (Cell Destroying)
An intense burning pain followed very soon after bite. The bitten area swells appreciably, becoming inflamed and discoloured, soon extending thought the whole limb, which remains, swollen and extremely painful. Gangrene and abscesses often form at the site of the bite. Death follows a state of unconsciousness and respiration and cardiac failure.
Myotoxic (Paralysis the skeletal muscles) This toxin has not been thoroughly studied and very little is known about its properties. This venom is suitable for fast moving prey such as reef fish. (Examples of these types of snakes is the Yellow-bellied Sea Snake)
There are three types of venomous land snakes: (Teeth/fanged)
Opisthoglyph: These are the rear-fanged snakes; the fangs are enlarged rear teeth with a 'groove' that venom flows down while they are swallowing the prey item. They are mostly harmless or mildly venomous but there are two BIG exceptions. The Boomslang (Dispholidus typus) and the Twig snake (Thelotornis kirtlandi) have killed humans before. Other good examples of this type of snake are the Mangrove (B. dendrophila) and Hognose snakes (Heterodon ssp.)
Proteroglyphs: These are the fixed front fang snakes. These snakes have small non-movable front fangs. When they bite they hang on and 'chew' to envenomate the prey. Obvious examples of this type of snake are the cobras (Naja), kraits (Bungarus), mambas (Dendroaspis), and coral (Micrurus) snakes. These are some of the deadliest snakes in the world.
Solenoglyph: These snakes have movable front fangs. The fangs fold back into the mouth until they are needed. This is what makes these snakes more dangerous work with. They can grab on to your hand like a cobra would but they can also open their mouth almost 180 degrees with the fangs extended straight out. This enables them to strike at any portion of your body because it is more of a 'stab' than a bite. Examples include rattlesnakes (Crotalus), eyelash vipers (Bothriechis), gaboon vipers (Bitis), cottonmouths and copperheads (Agkistrodon)

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