snake venom is not a single poison, but a mixture of toxins. each of those toxins, toxic substances, acts differently. most often they are components that act on red blood cells (hemotoxin) - they break down them, thus causing disorders in the oxygenation of organisms (suffocation). then it is a component acting on the muscles (myotoxin) - it causes, for example, cardiac arrest, convulsions, paralysis. and finally, they are substances acting on the nerves (neurotoxin) - they cause excitement disorders, such as brain / spinal cord commands for individual organs (kidneys (kidneys), liver (liver), ...), they cause nervous system failure, paralysis . Predators hunting snakes are immune or more resistant to these poisons (which, mungo, honeyeater, ...). it is similar with the producers of these poisons - they are immune to their own poisons. many of these poisons are poisonous only when applied to the blood (bites), but do not become poisonous when swallowed (broken down by stomach acids, sometimes even the saliva itself). (tuxedo)