What are nematocysts? And how much nematocysts are the in one jellyfish tentacle?

Question: What are nematocysts? And how much nematocysts are the in one jellyfish tentacle?
- Keywords:
  jellyfish,
  nematocyst,
  tentacle
Asked by Jessica209 to Jasmine on 16 Nov 2018.
- Jasmine answered on 16 Nov 2018:
  
  Nematocysts are the stinging cells on the tentacles of a jellyfish and there are thousands of them on each tentacle! Nematocysts are similar to the stinger on a bee or a wasp but they are much much smaller. You can fit about 100 nematocysts into 1 mm.

Question: What are nematocysts? And how much nematocysts are the in one jellyfish tentacle?