Their distinguishing feature is cnidocytes , specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea , a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick. They mostly have two basic body forms: swimming medusae and sessile polyps , both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes. Both forms have a single orifice and body cavity that are used for digestion and respiration. Many cnidarian species produce colonies that are single organisms composed of medusa-like or polyp -like zooids, or both hence they are trimorphic. Cnidarians' activities are coordinated by a decentralized nerve net and simple receptors.
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What Your Semen Says About Your Health
Jelly-like lumps in ejaculate: symptoms, causes and diagnosis
Lumpy, "gelatinous", "clotted", or globulous semen may be quite frightening or worrying to men who experience it, particularly if their semen's appearance has recently changed. What are the possible causes of lumpy semen, and do you need to see a doctor? Healthy, normal semen comes in a rather wide variety of colors, textures, and scents. Hence, a sudden change in the appearance of one's semen does not automatically signify a medical condition. Semen is composed of a large variety of different substances, of which only a small percentage is sperm. One of these substances is protein, which assists with the process of the semen's coagulation thickening and liquefaction. If your semen suddenly has a lumpy appearance after you have not ejaculated for a longer period of time weeks or months , this is your most likely culprit, something that will be confirmed if engaging in more regular sexual intercourse or masturbation solves the problem.
Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa , a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles , although a few are anchored to the seabed by stalks rather than being mobile. The bell can pulsate to provide propulsion for highly efficient locomotion.
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