Excretory Systems

Excretory Systems - Excretory Systems The excretion process...

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Unformatted text preview: Excretory Systems The excretion process is concerned with the removal of waste products from the animal body. Dependent upon the process of excretion is the relatively stable internal environment of the organism, a concept known as homeostasis. Homeostasis means staying the same. It refers to a relatively stable internal environment, or a steady-state equilibrium that exists internally in a healthy organism, despite changes in the external environment. The excretory system plays a major role in homeostasis. Because one-celled organisms are in constant contact with their environment, they do not need excretory organs. However, multicellular organisms need a mechanism to carry waste products from cells to the external environment. Flatworms, such as planaria, have a series of excretory cells, called flame cells . Flame cells contain cilia that direct water and metabolic wastes to enter the cells ....
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