Question

What is the function of Cnidocytes?

Answer 1

Cnidocytes:

1. A cnidocyte (also known as a cnidoblast or nematocyte) is an explosive cell containing one giant secretory organelle called a cnidocyst (also known as a cnida or nematocyst) that can deliver a sting to other organisms.
2. It is found in the organisms belonging to phylum Cnidaria (corals, sea anemones, hydrae, jellyfish, etc.).
3. Cnidae are used to capture prey and as a defense against predators.
4. A cnidocyte fires a structure that contains a toxin within the cnidocyst; this is responsible for the stings delivered by a cnidarian.

Functions of Cnidocytes:

1. Cnidocyte Capsule Composition: Cnidaria-specific genes combine with protein domains to form the cnidocyte capsule.
2. Discharge mechanism: Activation by a stimulus releases calcium ions causing increase in water volume in the cytoplasm. This forces the coiled cnidae tubule to eject rapidly.
3. Prey detection: The supporting cells contain chemo sensors, which, together with the mechanoreceptor on the cnidocyte allow the right stimuli to cause discharge.