At the narrow outer edge of the cnidocyte is a short trigger hair called a cnidocil.
3.
The externally oriented side of the cell also has a hair-like trigger called a cnidocil.
4.
The supporting cells contain chemosensors, which, together with the mechanoreceptor on the cnidocyte ( cnidocil ), allow only the right combination of stimuli to cause discharge, such as prey swimming, and chemicals found in prey cuticle or cuteous tissue.
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