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Homeostatic Control Systems
Transcript of Homeostatic Control Systems
Common Ancestry Julia Colton
04/29/13 Explanation Excretory Systems Flatworms Earthworms Vertebrates Flatworms have two tubular excretory organs that excrete wastes as well as maintaining the homeostasis of its salt to water ratio. It works by using flame cells located on the edges of the tubules to propel water and waste with tiny cilia through the tubules and out of the body. Excretory systems in earthworms are called nephridias, and are found in nearly every segment of an earthworm's body. Fluid travels from the coelom and through nephridias, all the while propelled by finger-like cilia. As the fluid travels, its composition changes. Nutrients are reabsorbed and carried via a network of capillaries. Vertebrates excrete one of three wastes: ammonia, urea, or uric acid. The process of ammonia excretion is direct, and much like that of the planarian and earthworm. Urea is produced in the liver and is excreted differently, depending upon the animal. Uric acid is also produced in the liver and is stored in the cloaca. Excretory systems in flatworms, earthworms and vertebrates all include a basic means of excreting wastes, which then gradually becomes more and more complex. Flatworms Basic Tubules Earthworms Tubules that Absorb Nutrients Vertebrates Tubules + Liver The End