When something comes in contact with the tentacle — a fish or a human — tiny triggers on the surface of the tentacle release the nematocysts. The sharp tube penetrates the skin and releases the venom, which affects the immediate area of contact and may enter the bloodstream.
Jellyfish are free-swimming marine creatures that float with the winds and currents with a nearly transparent body and long tentacles with stinging cells (nematocysts).
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