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Nematocisto

Mecanismo de descarga do nematocisto

O nematocistos (do grego nematos, fio[1]) é a denominação dada a qualquer tipo de organela ou cápsula aderente que ocorre em todas as classes de celenterados exceto a Ctenophora. São distribuídos nos tentáculos em especial nas células epideriais ou cnidoblastos.[2]

Os nematocistos se abrem quando tocados e liberam substâncias tóxicas como a tetramina, a histamina, a serotonina e a 5-hidroxitriptamina. Essas substâncias afetam o SNC causando hemólise, insuficiência renal, erupções cutâneas, urticária, bolhas, necrose, dor etc.[3]

Referências

  1. Infopédia. «nemat(o)- | Definição ou significado de nemat(o)- no Dicionário Infopédia da Língua Portuguesa». Infopédia - Dicionários Porto Editora. Consultado em 8 de abril de 2021 
  2. Robert Alan Lewis (1998). Lewis' Dictionary of Toxicology. CRC Press. p. 734. ISBN 978-1-56670-223-2.
  3. Luiz Roberto Tommasi (2008). Meio Ambiente E Oceanos. Senac. p. 130. ISBN 978-85-7359-770-7.
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Nematocisto
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