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Name the types of nitrogenous bases present in the RNA. One of the primary functions of this system is filtration of blood. The ambulacral grooves and the anus are absent. Osmoregulation refers to the state aquatic animals are in: they are surrounded by freshwater and must constantly deal with the influx of water. It is one of the major ways the body maintains homeostasis. The bursae are ten in number and open to the exterior through slit-like apertures, situated one on each side of the base of the arms. This means that Lungs are a vital part of our Excretory System. Members of this class show highly specialised and complex structural organisation amongst the molluscs. The tube-feet, as described earlier, have nothing to do with locomotion. TOS4. Biology, Articles on Animals, Phylum Echinodermata, Example, Ophiura. Kidneys filter the blood and urine is the filtrate obtained. For one, the kidneys are expected to filter blood from the urine, and if there is blood in one's urine, they need to see the doctor. However, when spoken in the narrow sense, people use Excretory System and Urinary System synonymously. The system consisting of two kidneys, two ureters, one urinary bladder, and one urethra performs the work of collecting, storing and removing all the liquid waste products from the body. SURVEY . These cells combine to form various tissues. 16 terms. It is involved in circulation of blood throughout the body. Blood is important to the excretory system. So, it is now time to get back to the original topic – the Excretory System of human body. 30 seconds . Keep reading…, Explore More: [wc_fa icon=”hand-o-right” margin_left=”” margin_right=”” class=””][/wc_fa] 25 Facts About Human Liver. 30 Solar System Facts Everyone Should Know. The epidermis is vestigial and the dermis is devoid of muscles. Share Your Word File Which organelle is known as “power house” of the cell? Reproductive System 11. ophiura is without A.digestive system B.water vascular system C.excretoty system D.larva in development - 19432395 The body of Ophiura consists of a star- shaped disc and five highly flexible arms (Fig. Working on fats, the Bile will break down the fats into usable fats and unusable fats. Through the bursae a constant flow of water current is maintained which possibly helps in the process of respiration. How the vascular cambium is responsible for secondary growth? So, this brings us to the question, ‘what are the organs involved in Excretory System?’, Here is something interesting. They usually hide them- selves at daytime beneath the sea-weeds or stones. Excretory System. Urine is the result of the excretory system balancing the amount of water and salts in your body. So, maintaining a constant concentration is important. Presence of those chemicals will only damage our body. Explore More: [wc_fa icon=”hand-o-right” margin_left=”” margin_right=”” class=””][/wc_fa] 20 Interesting Human Lungs Facts. Crustacean - Crustacean - Form and function of internal features: The crustacean nervous system consists basically of a brain, or supraesophageal ganglion, connected to a ventral nerve cord of ganglia, or nerve centres. Respiratory System 7. Ophiura ophiura or the serpent star is a species of brittle star in the order Ophiurida. Our mission is to provide an online platform to help students to share notes in Biology. The urinary system, especially, eliminates a type of waste called urea from the body. Also, Liver is responsible for production of Bile.