A cnidocil is a trigger-like structure found on cnidocytes (stinging cells) that, when stimulated, causes the discharge of a nematocyst.
Cnidocil Explained
The cnidocil is a key component in the stinging mechanism of cnidarians such as jellyfish, sea anemones, and corals.
- Definition: According to the provided reference, a cnidocil is "a minute process of a nematocyst that when touched is believed to cause the projection of the stinging thread."
- Function: It acts as a sensory trigger. When something makes contact with the cnidocil, it initiates a rapid mechanical process that leads to the discharge of the nematocyst. The nematocyst contains a coiled, thread-like structure that can penetrate prey or deliver venom.
- Structure: The cnidocil is a hair-like projection extending from the surface of the cnidocyte.
Importance
The cnidocil is vital for:
- Prey capture: Enables cnidarians to immobilize and capture prey.
- Defense: Provides a defense mechanism against predators.
