Snake venom is highly modified saliva containing
zootoxins that facilitates the immobilization and digestion of prey, and defends against a threat. These venoms are mostly a mixture of proteins and polypeptides with toxic properties.
Here are the venoms that different types of snakes possesses.


Hemotoxic (Haemotoxic, Hematotoxic) Venom
This type of snake venom destroys red blood cells – causes hemolysis, disrupts blood clotting, and also attacks other types of cells and tissues – causing profound tissue damage and often, organ failure. These types of bites are very painful. Effects may not begin for hours after a bite. Permanent tissue damage almost always results. A person bitten by a snake with hemotoxic venom may bleed from orifices like nose, eyes, and also gums and the brain. If bitten on the toe, finger, or some extremity you can usually expect to lose part or all of that body part.
Snakes which have heamotoxic venom include: the Boomslang ( a back fanged snake from Africa) and the Vine Snake

Neurotoxic Venom
Neurotoxic venom is very dangerous and swift, affecting the nervous system. There may be little pain or swelling when bitten by a snake with predominantly neurotoxic venom. Once bitten a human has a progressive paralyzation of the muscles of the body, followed by death from respiratory failure as your diaphragm fails to work anymore. Initially an envenomated bite causes ptosis, droopy eyelids, blurred vision, and a sleepy, dazed-like paralysis. There is sometimes excess salivation and vomiting.
Pre-synaptic neurotoxins damage nerve endings while post-synaptic neurotoxins block acetylcholine from binding – leading to a neuromuscular paralysis.
Snakes which have neurotoxic venom include: Almost all of the Cobras, Mambas, Coral Snakes, Banded Kraits and Yellow Bellied Sea Snakes.