cnidoblast

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Related to Cnidocyte: Colloblast

cnidoblast

or

nematoblast

a stinging THREAD CELL. see NEMATOCYST.
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Hydra are members of a family of radially symmetric animals (Cnidaria), all of which use specialized cnidocytes to catch prey.
Hydra tentacles contain barbed, poison containing cnidocytes that they use to stun animals like the water flea, Daphnia, before eating them alive, and to protect themselves from attack by other animals.
Neural control of cnidocyte discharge is also present in a more global context inasmuch as the threshold for discharge is greatly elevated in Hydra fed to repletion (Smith et al.
A further elaboration of the concept that cnidocytes contain the machinery of chemical synapses is the understanding that cnidocyte discharge is an exocytotic process.
The cnidocytes mediate the killing, capture, and transport of prey to the centrally located mouth.
Once again, these cnidocyte bands were associated with a dense plexus of immunoreactive neurons that was located in the ectoderm of the tentacle, at the base of the cnidocytes (Fig.
Exposure to continuous light enhanced the uniformity of anemone behavior and cnidocyte responsiveness.
Exposure to continuous light enhanced uniformity of anemone behavior and cnidocyte responsiveness.
Brooks and Mariscal (1985) suggested that this crab might be accustomed to stinging cnidocytes because anemones (which are also equipped with cnidocytes) are often found on its carapace.
sivickisi are attached to the substrate in the tanks, probably using special cnidocytes (Hartwick, 1991), and we tested different natural substrates to look for possible preferences.
Ultrastructural evidence exists in anthozoans as well, that cnidocytes originate in the column and migrate to the tentacles (Schmidt and Moraw, 1982).
Furthermore, fewer cnidocytes are sacrificed during the firing of a few large spirocytes than by firing many small ones.