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Cnidocyte - Biocrawler Cnidocytes are prey-capture and defensive cells unique to animals of the phylum Cnidaria. Cnidocytes contain specific organelles named nematocysts that are used for self-defense and prey capturing. The Ctenophora ("sea-gooseberries" or "comb jellies") are a group of transparent, jelly-like sea creatures belong to a different phylum; these animals have no nematocysts at all and are harmless to humans. www.biocrawler.com /encyclopedia/Nematocyst   (361 words)

Cnidocyte - Wikivisual Cnidocytes, also known as cnidoblasts or nematocytes, are prey-capture and defensive cells unique to and present in all animals of the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish etc.). The supporting cells contain chemoreceptors, which together with the mechanoreceptor on the cnidocyte (cnidocil) allow only the right combination of stimuli (prey swimming, chemicals found in prey cuticle or skin, etc.) to cause the cnidocyst to discharge. The most deadly cnidocytes (to humans, at least) are found on the box jellyfish's body. en.wikivisual.com /index.php/Cnidocyte   (705 words)

Cnidaria - Encyclopedia Jr, free information reference for Kids Cnidarians get their name from cnidocytes, which are specialized cells that carry stinging organelles. The corals, which are important reef-builders, belong here, as do the familiar sea anemones, jellyfish, sea pens, sea pansies and sea wasps. Cnidarians take their name from a specialised cell, the cnidocyte (nettle cell). www.encyclopediajr.com /wikiarticle/c/n/i/cnidaria.php   (2656 words)

Cnidocyte Anatomy Cnidocytes are prey-capture and defensive cellsunique to animals of the phylum Cnidaria. In order to regulate their use, cnidocytes are connected as "batteries", containing several types of nematocytes connected to supporting cells and neurons. In this context it is worth noting that venom from cnidarians, as well as other venomous animals such as scorpions, spidersand others, may be species selective: what we consider as "weak toxicity" due to the low activity on humans (or other mammals) may be very potent towards the natural prey or predators of these animals. www.lumrix.com /medical/anatomy/cnidocyte.html   (700 words)

NationMaster - Encyclopedia: Cnidocyte   (Site not responding. Last check: ) Cnidocytes, also known as cnidoblasts or nematocytes, are prey-capture and defensive cells unique to and present in all animals of the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish etc.). The supporting cells contain chemoreceptors, which together with the mechanoreceptor on the cnidocyte (cnidocil) allow only the right combination of stimuli (prey swimming, chemicals found in prey cuticle or skin, etc.) to cause the cnidocyst to discharge. Cnidocytes are single cells which contain a subcellular organelle named cnidocyst. www.nationmaster.com /encyclopedia/Cnidocyte   (1413 words)

Cnidocyte Cnidocytes are prey-capture and defensive cells found on animals of the phylum Cnidaria. Cnidocytes have unique cell structures in them called nematocysts that are used to capture prey. Nematocysts are composed of a coiled thread-like structure attached to the bulb-shaped nematocyst cell body. www.ebroadcast.com.au /lookup/encyclopedia/cn/Cnidocyte.html   (145 words)

Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal A cnidocyte, cnidoblast or nematocyte, is a type of venomous cell unique to the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish, etc.). The supporting cells contain chemoreceptors, 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 skin. The most deadly cnidocytes (to humans, at least) are found on the body of a box jellyfish. www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=cnidocyte   (732 words)

Cnidocyte mechanoreceptors are tuned to the movements of swimming prey by chemoreceptors -- Watson and Hessinger 243 ... Cnidocyte mechanoreceptors are tuned to the movements of swimming prey by chemoreceptors -- Watson and Hessinger 243 (4898): 1589 -- Science Moreover, in the presence of submicromolar concentrations of known chemosensitizers, such as N-acetylated sugars and mucin, these optima shift to 5, 15, 30, and 40 hertz, frequencies that correspond to the movements of swimming prey. Hence, chemoreceptors for these substances tune cnidocyte mechanoreceptors to frequencies that match the movements of the prey. www.sciencemag.org /cgi/content/abstract/243/4898/1589   (382 words)

Cloning and functional expression of voltage-gated ion channel subunits from cnidocytes of the Portuguese Man O'War ... Cnidocytes were dissociated from the tentacles of the Portuguese discharge of Hydra cnidocytes is abolished in the absence of Micrographs of cnidocytes isolated from the tentacles of Physalia physalis. jeb.biologists.org /cgi/content/full/209/15/2979   (4731 words)

Cnidocyte information - Search.com Cnidocytes, also known as cnidoblasts or nematocytes, are prey-capture and defensive cells unique to and present in all animals of the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish etc.). The supporting cells contain chemoreceptors, which together with the mechanoreceptor on the cnidocyte (cnidocil) allow only the right combination of stimuli (prey swimming, chemicals found in prey cuticle or skin, etc.) to cause the cnidocyst to discharge. The most deadly cnidocytes (to humans, at least) are found on the box jellyfish's body. domainhelp.search.com /reference/Cnidocyte   (715 words)

EM PROJECT: CHARLES MOFFET Within the cnidocytes is the nematocyst which is an inverted tubule armed at one end with a harpoon exhibiting hooks and spines (Watson 1988). Exterior to the capsule projecting from the apical surface of the cnidocyte is the cnidocil, a modified flagellum portraying the typical 9+2 microtubule configuration. Cnidocyte showing an oblique section of a fully mature nematocyst. www.csulb.edu /~zedmason/emprojects/charlie/moffet.html   (1141 words)

Reference.com/Encyclopedia/Cnidocyte Cnidarians are a morphologically simple phylum of aquatic animals that lack a skeleton; many of them are sessile. In order to catch their prey and defend themselves from predators cnidarians have evolved a unique "weapon system" - the cnidocytes; these are single cells able to shoot structures at their target and inject toxic substances into it. Cnidocytes are single cells, each containing a subcellular organelle called a cnidocyst. www.reference.com /browse/wiki/Cnidocyte   (737 words)

invert_4.html [radiata]   (Site not responding. Last check: ) Cnidocytes are cells that capture prey and defend against attack. The primary weapon of a cnidocyte is a stinging capsule called a nematocyst. Cnidarians have the simplest muscles and nerves which are located in the epidermis and gastrodermis (cells with microfilaments and contractile fibers); however there is no true muscle because it is a diploblastic organism. library.thinkquest.org /C006669/data/Biol/invert_4.html   (234 words)

RISE I CARE   (Site not responding. Last check: ) Cnidocytes are specialized secretory cells within the epidermis of the tentacles of all cnidarians. The cnidocyte, with its supporting cells, constitute what is called the Cnidocyte Supporting Cell Complex (CSCC), the functional unit for the nematocyst discharge. By measuring the relative percentage of prey killed when treated with the toxins, it appears that both the K v and K Ca Channels are associated with Type B CSCCs, and there is a possibility that K v channels are associated with Type A CSCCs. www.oakwood.edu /biology/subsite03/archive/05to06/abstractsf05/Salim.htm   (351 words)

BioG 105/106 | Autotutorial Introductory Biology Cnidocytes = "nettle cells", prey-capture and defensive cells found on animals of the phylum Cnidaria. Cnidocytes have unique organelles in them called cnidae that are used to capture prey. The externally-oriented side of a cnidocyte cell also has a hair-like trigger on it. instruct1.cit.cornell.edu /Courses/biog105/labs/inverts/cnidaria.html   (444 words)

EM PROJECT: MICHELLE JOHNSON AND MISTY BORJA Intact nematocysts were observed within these cells in light micrographs, and, although the structures were removed during thin sectioning, a peri-nematocyst membrane could be observed delineating the nematocyst implying that it was of extracellular origin and had been internalized, presumably by a process such as phagocytosis. Cytoplasmic vacuolation was observed in these newly formed molluscan cnidocytes, the degree of which was correlated to their location in the tubule. This progression is interpreted as being indicative of a process which involves the development of the immature cnidocyte as it migrates proximally into the lumen of the cnidosac. www.csulb.edu /~zedmason/emprojects/misty/nudibr.html   (1810 words)

ARKive species | Introduction to corals Coral is the common name for a number of marine animals closely related to sea anemones, sea pens, jellyfish and hydroids. These groups are collectively known as the phylum Cnidaria, and are characterised by their simple body plan with two cell layers, and unique 'stinging' cells, known as cnidocytes, which are used for prey capture and defence. Cnidocyte: A cell housing a thread-like 'sting' called a nematocyst, unique to cnidarians. www.arkive.org /coral/Coral/introduction_coral.html   (383 words)

Evidence for a Common Pattern of Peptidergic Innervation of Cnidocytes -- Anderson et al. 207 (2): 141 -- The ... The cysts of the cnidocytes appear as unstained circles (asterisks). Immunoreactivity is present in the ectoderm along the entire length of the tentacle, but is concentrated at the base of the cnidocytes. The cnidocytes are found in regularly spaced girdles that encircle the tentacles. www.biolbull.org /cgi/content/full/207/2/141   (3224 words)

Re: Do the darts on a sea anemone actually detach from the tentacles? The animal's tentacles are loaded with batteries of these cnidocytes, and snag/harpoon/ poison small animals that swim or blunder into them. Each cnidocyte can be used only once, and here's an explanation for why: Inside the cnidocyte is a capsule called a cnida. Even if most of the cnidocytes are blown out during a feeding bout, the anemone can probably replace its arsenal within a day or so. www.madsci.org /posts/archives/apr2001/987118887.Zo.r.html   (251 words)

PPT Slide Prey capture is enhanced by use of specialized stinging cells called cnidocytes located in the outer epidermis. Each cnidocyte has a modified cilium - cnidocil, and is armed with a stinging structure called a nematocyst. When triggered to release, either by touch or chemosensation, the nematocyst is released from the cnidocyte and the coiled thread is everted faculty.evansville.edu /de3/b10802/PPoint/Cnidaria/tsld006.htm   (82 words)

Zooplankton The open ocean is therefore a source of zooplankton that gets washed over the reef in currents and is stripped from the water by planktivorous fish and filter feeding organisms. Cnidarians possess special cells called cnidocytes that are especially abundant in the tentacles. These types are used to wrap around small animals and entangle them. www.coexploration.org /bbsr/coral/html/body_zooplankton.html   (731 words)

Wonders of the Sea: Cnidarians Yet, these diverse animals are united because they are all armed with stinging cells called cnidocytes and contain a structure called a nematocyst. When the nematocyst is called upon to fire, the thread is uncoiled, and springs straight. The harpoon-like thread punctures through the cnidocyte wall and into the prey. www.oceaninn.com /guides/cnidarians.htm   (1767 words)

LEO Forum Craspedacusta sowerbyi possess cnidocytes with nematocysts, otherwise known as stinging cells. The cnidocyte produces a specialized organelle called the nematocyst. Aber cnidocyte ist um mehrere Größenordnungen gebräuchlicher, wenn man die ausdifferenzierte und voll funktionstüchtige Nesselzelle an sich meint. dict.leo.org /forum/viewWrongentry.php?idThread=294505&idForum=7&lp=ende&lang=de   (373 words)

Lander University | Obelia Cnidocytes contain an explosive organelle, the cnida, which, upon proper stimulation, inverts and ejects a slender, often barbed and toxic thread in the direction of prey or predator (Fig 7-9). All cnidarians are carnivores feeding on live prey which they usually capture using tentacles armed with cnidocytes. Cnidocytes are found only in the epidermis and germ cells arise in the gastrodermis but may, or may not, migrate to the epidermis to form gonads and mature into gametes. webs.lander.edu /rsfox/invertebrates/obelia.html   (1923 words)

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