what is the function of the central disk in a starfish?
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This central disc is the activity centre of the starfish and also contains the mouth of the starfish. The starfish feeds on oysters and clams, the 2 stomachs of the starfish helping with the digestion of complex organisms.
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In cell biology, the centrosome (Latin centrum 'center' + Greek sōma 'body') is an organelle that serves as the main microtubule organizing center (MTOC) of the animal cell, as well as a regulator of cell-cycle progression.
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Tunicates are considered acraniate chordates because tunicates and chordates have the following features in common: a notochord; a dorsal, hollow nerve cord; and pharyngeal gill slits at some time in their lives. ... In vertebrates, the nerve cord becomes the spinal cord and brain.
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In cell biology, the centrosome (Latin centrum 'center' + Greek sōma 'body') is an organelle that serves as the main microtubule organizing center (MTOC) of the animal cell, as well as a regulator of cell-cycle progression. The centrosome is thought to have evolved only in the metazoan lineage of eukaryotic cells.
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Starfish cannot live in fresh water due to the changes in salinity. ... Ions of salt and other minerals are higher in the cells of the starfish. Water will rush into the cells causing them to swell and eventually rupture killing the cells as the minerals try to disperse into the water and dilute.
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What is another function of the Smooth Endoplasmic Reticulum? Final production of glucose, an energy storage molecule. ... One of the primary functions of the Smooth Endoplasmic Reticulum is to produce and move lipids, an essential component of a cell's outer membrane, and steroids.
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Among its roles in plant cell function, the central vacuole stores salts, minerals, nutrients, proteins, pigments, helps in plant growth, and plays an important structural role for the plant.
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The water vascular system is a hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration. The system is composed of canals connecting numerous tube feet.
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Because their body is 95% water, they are perfectly camouflaged. The body of a jellyfish exhibits radial symmetry and is divided into three main parts: the umbrella, the oral arms (around the mouth) and the stinging tentacles. They have an internal cavity, in which digestion is carried out.
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Starfish have eyes—one on the end of each of their arms—but what they do with them was anyone's guess. Starfish have historically been thought of as simple animals. Since their eyes are also relatively simple and because they lack a brain, it was difficult to figure out how or even if they could see.
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The gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Cnidaria (including jellyfish and corals) and Platyhelminthes (flatworms). ... This cavity has only one opening to the outside which, in most cnidarians, is surrounded by tentacles for capturing prey.
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Cilia are present on the gill filaments in the lateral, laterofrontal and frontal cells and each type have specific arrangements and functions. Lateral cilia serve a vital function by generating the water currents that allow gas exchange as well as regulate food intake and waste removal.
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A brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It is located in the head, usually close to the sensory organs for senses such as vision. It is the most complex organ in a vertebrate's body.
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Echinoderms all have a network of nerves called nerve plexus. These nerves run intertwined under the surface of an Echinoderm's skin. Although the echinoderms do not have many well-defined sensory inputs, they are sensitive to touch, light, temperature, orientation, and the status of water around them.
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Sand Sifting Sea Stars (Starfish) are exceptionally reef-safe; they only provide benefits to your tank. Every marine tank should have one of these long-lived beautiful animals.
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Central Nervous System The main function of the CNS is the integration and processing of sensory information. It synthesizes sensory input to compute an appropriate motor response, or output.
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Characteristics of Echinoderms Echinoderms are characterized by radial symmetry, several arms (5 or more, mostly grouped 2 left - 1 middle - 2 right) radiating from a central body (= pentamerous). The body actually consists of five equal segments, each containing a duplicate set of various internal organs.