What is the difference between cnidocyte and nematocyst?

What is the difference between cnidocyte and nematocyst?

A cnidocyte is an explosive cell having within it a giant secretory organelle (organ) called cnida which is a characteristic of the phylum Cnidaria. A Nematocyst is a specialized sub-cellular organelle (part of the cell) present in cnidocyte. Thus, a nematocyst is essentially a part of a cnidocyte.

What is the structure and function of a cnidocyte?

What is the structure and function of a cnidocyte? It is the stinging cell of the cnidarian which contains a capsule called the nematocyst which is lined with the actual stinging structure, a barbed thread. What causes the cnidocyte to trigger? The trigger is activated by both chemical stimuli and nerve impulses.

What are the stages of a nematocyst discharge?

It shows the nematocyst in three stages of discharge. First, the inverted harpoon is packed within the capsule. The harpoon is inside-out at this point. Second, a stimulus has led the capsule to pressurize, swinging open the operculum (the trap door at the top), and begin everting the poison filled thread.

What are cnidocytes and nematocysts and what is the role of these structures?

Cnidarians contain specialized cells known as cnidocytes (“stinging cells”) containing organelles called nematocysts (stingers). These cells are present around the mouth and tentacles, and serve to immobilize prey with toxins contained within the cells. Nematocysts contain coiled threads that may bear barbs.

What is the relationship between a nematocyst and cnidocyte?

Cnidocyte and nematocyst are two structures that aid in the capturing of the prey by cnidarians. Cnidocyte is an epidermal cell that contains the nematocyst. Cnidoctes can be found in the tentacles of the cnidarians. The nematocyst is the organelle inside the cnidocyte used to inject toxins into the prey.

What is the main function of nematocysts?

Nematocysts or cnidocysts represent the common feature of all cnidarians. They are large organelles produced from the Golgi apparatus as a secretory product within a specialized cell, the nematocyte or cnidocyte. Nematocysts are predominantly used for prey capture and defense, but also for locomotion.

How do humans use cnidarians?

Human uses: All kinds of corals hard and soft, sea anemones and other cnidaria are extensively harvested from the wild for the live aquarium trade. Hard coral are also mined as building materials in some coastal areas. Living coral reefs, however, are worth far more to humans when they left alone.

What is the common adaptation which unites them into the common group of cnidaria?

What is the common adaptation , which unites them into the common group of Cnidaria? Their ability to sting their prey. What language was the word Cnidaria derived from and what does the word mean? The language the word Cnidaria derived from is Greek and it means stinging nettle.

What are the three types of nematocysts What are each of their functions?


  • Nematocyst. This is the main type, present in all Anthozoa. It is a harpoon-like structure which holds and paralyses small prey.
  • Ptychocyst. This puts out a sticky substance.
  • Spirocyst. This is a lasso-like string that is fired at prey.

What is the meaning nematocyst?

Nematocyst, minute, elongated, or spherical capsule produced exclusively by members of the phylum Cnidaria (e.g., jellyfish, corals, sea anemones). Several such capsules occur on the body surface.