nematocyst In Cnidaria, part of a cnidoblast; it is a pear-shaped sac with a lid (operculum), the outer end of the sac being extended to form a long, hollow thread which is stored coiled within the sac, immersed in a fluid. On stimulation of a sensory bristle (a cnidocil) the thread is expelled, as a weapon or to capture or hold prey, depending on the type of nematocyst. Some nematocysts are barbed and some inject venom.
nematocyst In Cnidaria (sea anemones, jellyfish, and corals), part of an epidermal cell (cnidoblast), comprising a sac with a lid, the open end of the sac being extended into a long, hollow thread. The thread is stored inside the sac, coiled and immersed in a fluid. When a sensory bristle (cnidocil) is stimulated, the thread is expelled to capture or hold prey or as a weapon, depending on the type of nematocyst. Some nematocysts are barbed and some inject venom.
nematocyst See thread cell.
More From encyclopedia.com
Cell , Cell The cell is the basic unit of a living organism. In multicellular organisms (organisms with more than one cell), a collection of cells that work… Virus , Virus A virus is a package of chemicals that infects living cells. Composed only of some genetic material inside a protein coat, it is not considered… Vacuole , Vacuoles are organelles of plant, fungal, and algal cells. They are part of the internal membrane system and are separated from the rest of the cytop… Endocytosis , The ability to internalize material from outside the cell is important for several cellular processes including the ingestion of essential nutrients,… Adherens Junction , adherens junction A cell junction that is commonly observed in epithelial (see EPITHELIUM) cells (e.g. those lining the intestine and those in cardia… Cells , Cells Plants are multicellular organisms composed of millions of plant cells. Although individual cells may differ greatly from each other in mature…
About this article
All Sources -
Updated Aug 08 2016 About encyclopedia.com content Print Topic
You Might Also Like