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The stinging cell of a cnidarian contains a sac that houses a coiled up tube, immersed in venomous toxins. When triggered to fire by touch, chemical stimuli, and/or nerve excitation, a hinged lid opens, the tube rapidly shoots out of the sac by eversion (turning inside out), penetrates the skin of its victim, and introduces its venom along the entire length of the tubule. When large numbers of these stinging cells deliver a sufficient amount of venom, the prey (or predator) is paralyzed and can no longer cause damage to the fragile jellyfish.
The entire evagination process only takes a millisecond or two. These stinging cells are some of the most sophisticated in the entire animal kingdom. They fire only once and then are re-adsorbed, to be eventually replaced by a brand new stinging cell. New nematocyte stinging cells (containing the nematocyst sac organelle) are created near the base of a tentacle from interstital stem cells. They migrate down the tentacle while developing the complex internal nematocyst structure, and eventually distribute themselves into a species specific pattern along the tentacle.
What else can I help you with?
What is a capsule on a cnidarians tentacle called?
Nematocysts
Explain how cnidocytes with their nematocysts function in food capture and defense?
Cnidocytes are specialized cells found in cnidarians that contain stinging structures called nematocysts. When triggered, nematocysts shoot out barbed threads that inject toxins into prey for food capture. In defense, nematocysts can be used to deter predators by stinging them.
What structure are the stinging cells of cnidarians located?
The stinging cells of cnidarians, called cnidocytes, are located on specialized structures called nematocysts. These nematocysts are found on the tentacles of cnidarians and are used for defense and capturing prey.
What is one type of cell all cnidarians have?
Cnidarians all have stinging cells called nematocysts with which to catch their prey.
What is another word for stinging cells?
I think it's called cnidarians
What do cnidarians use to defend themselves?
cnidarians have stinging cells called nematocysts located on their tantacles
What is the function of a cnidocyte cell?
Cnidocytes are specialized cells found in cnidarians (such as jellyfish and sea anemones) that contain stinging organelles called nematocysts. The function of a cnidocyte cell is to capture prey or defend against predators by discharging venom-filled nematocysts in response to touch or chemical stimuli.
What cells do cnidarians use for protection?
Cnidarians use specialized stinging cells called cnidocytes for protection. These cells contain nematocysts, which can inject venom into potential threats or predators. When triggered, the nematocysts shoot out barbed threads that can immobilize prey or deter predators.
What type of animal uses toxins on nematocysts to capture prey?
jellyfish and mosquitoes are two creatures that have nematocust a stinging cell used by animals hunting and stunning their prey
Where are nematocysts located?
Nematocysts are located on the tentacles of cnidarians, such as jellyfish and anemones. They are specialized stinging cells used for capturing prey and defending against predators. When triggered, nematocysts release a harpoon-like structure that injects toxins into the target.
Where are the nematocysts of the hydra located?
The nematocysts are stinging cells of cnidarians located all along the feeding tentacles. These cells are inverted "harpoons" that react physically and chemically to stimuli at a speed of 1/1000th of a sec.
What two functions do nematocysts perform?
Nematocysts are the stinging cells on tentacles of a cnidarian, like a jellyfish. Since jellyfish don't have any teeth, and their body consists of gelatin, it's hard to capture prey. Nematocysts help jellyfish with feeding by stinging the prey in an attempt at trying to immobilizing the prey.
