do cnidarians have nervous system?
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Cnidarians have nerve cells that are organized in a nerve net – a diffuse network where neurons interact wherever they cross one another. There are two contrasting types of body symmetry: radial and bilateral. Nerve nets are associated with the former and central nervous systems with the latter.
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Cnidarians are carnivores, and some can also consume plant matter. They catch their food using their nematocysts or through filter feeding. Cnidarians digest their food using a primitive digestive system that contains no organs--they have a mouth (which also serves as the anus) and a gastrovascular cavity.
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Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system. They also have a brain.
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Cnidarians have two body forms—polyp and medusa—which often occur within the life cycle of a single cnidarian. The body of a medusa, commonly called a jellyfish, usually has the shape of a bell or an umbrella, with tentacles hanging downward at the margin. ... Most medusae are slow-swimming, planktonic animals.
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Some examples of coelenterates include jellyfish, anemones and coral. Historically, scientists used the term “coelenterate,” which refers to the cavity-like bodies of the animals, to identify the phylum now called cnidaria. All coelenterates are aquatic, and while most are marine, a few lineages inhabit fresh water.
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Ecology of Cnidarians Some cnidarians live alone, while others live in colonies. Corals form large colonies in shallow tropical water. They are confined to shallow water because they have a mutualistic relationship with algae that live inside them.
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The simplest animals include the sponges (Porifera) and the Cnidaria. ... Coelenterates (phylum Cnidaria) are radially symmetrical, with two tissue layers (ectoderm and endoderm) surrounding an all-purpose gastrovascular cavity.
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Poriferans, Echinoderms, and Cnidarians live in the water. Poriferans (phylum Porifera) are sponges. ... Echinoderms have digestive and circulatory systems, but no excretory or respiratory systems. They move using the a hydraulic system called the water vascular system.
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Body plan. The body plan of cnidarians is unique because these organisms show radial symmetry, making these animals very different from those that evolved before them. Radial symmetry means that they have a circular body plan, and any cut through the center of the animal leaves two equal halves.
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Both ctenophores and cnidarians have a type of muscle that, in more complex animals, arises from the middle cell layer, and as a result some recent text books classify ctenophores as triploblastic, while others still regard them as diploblastic.
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Hi Ritika, In coelenterates, specialised cells called cnidoblasts are present, which contain stinging cell organelles called nematocysts. Nematocysts help to paralyse or hold the prey by injecting poison present within it.
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Roundworms are more complex than cnidarians because roundworms have organs and organ systems, while cnidarians have only specialized tissues.
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Like the remaining subphylum of the chordates, the Vertebrata, the protochordates have a hollow dorsal nerve cord, gill slits, and a stiff supporting rod, the notochord, the forerunner of the backbone. The protochordates differ chiefly from the vertebrates in not having a backbone.
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The nervous system is a complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body. The nervous system includes both the Central nervous system and Peripheral nervous system.
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Central nervous system The bodies of crustaceans are segmented; there is one ganglion (cluster of nerve cells) per segment. Each ganglion receives sensory and movement information via nerves coming from the muscles, body wall, and appendages such as walking legs, swimmerets and mouthparts.
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Structurally, the nervous system has two components: the central nervous system and the peripheral nervous system. According to the National Institutes of Health, the central nervous system is made up of the brain, spinal cord and nerves.
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The Central Nervous System (CNS) includes all of the nerves of the Brain and Spinal Cord. The Peripheral Nervous System (PNS) includes all of the nerves both sensory and motor connecting the CNS to the muscles, organs, and sensory structures of the body.