Excretion: Difference between revisions
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Excretion is the removal of toxic substances and [[Metabolism|metabolic]] waste products<ref>Britannicacom. 1. Encyclopedia Britannica. [Online]. Available from: https://www.britannica.com/science/excretion [Accessed 5 December 2016].</ref>. Every organism, from the smallest protist to the largest mammal, must cleanse itself of the potentially toxic by-products of its own vital activities. This process in living things is named elimination, which may be considered to include all of the different mechanisms and processes by which life forms dispose of or gets rid of waste products, harmful substances, and perished portions of the organism | Excretion is the removal of toxic substances and [[Metabolism|metabolic]] waste products<ref>Britannicacom. 1. Encyclopedia Britannica. [Online]. Available from: https://www.britannica.com/science/excretion [Accessed 5 December 2016].</ref>. Every [[organism|organism]], from the smallest [[protist|protist]] to the largest [[mammal|mammal]], must cleanse itself of the potentially toxic by-products of its own vital activities. This process in living things is named elimination, which may be considered to include all of the different mechanisms and processes by which life forms dispose of or gets rid of waste products, harmful substances, and perished portions of the organism<ref>https://www.britannica.com/science/excretion</ref>. In [[Vertebrates|vertebrate]] animals, this process is mainly carried out by the [[Lungs|lungs]], [[Skin|skin]] and the [[Kidneys|kidneys]]<ref>Wikipediaorg. 2. Wikipediaorg. [Online]. Available from: https://en.wikipedia.org/wiki/Excretion [Accessed 5 December 2016]</ref>, with the [[urinary system|urinary system]] being the main excretory system. Excretion through the skin occurs through [[sweat|sweating]], which results in the removal of [[Water|water]] and small amounts of [[Urea|urea]] and salts. The [[Kidneys|kidneys]] filter about 180 litres of [[Blood|blood]] everyday and removes urea, toxins, medications, and excess ions through the formation of [[Urine|urine]]<ref>http://science.jrank.org/pages/2626/Excretory-System-Excretion-in-humans.html</ref>. | ||
An example of such is cell excretion process. The cell clears its waste products by bringing the waste products close to the cell membrane and then closing the cell membrane around the waste products, isolating it from the rest of the cell. Then the cell could open the cell membrane on the outside of the cell, letting the products out without losing any cytoplasm or letting anything else in<ref>https://quatr.us/biology/cells-get-rid-waste-excretion-cell-biology.htm</ref>. | |||
An example of such is cell excretion process. | |||
=== References === | === References === | ||
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Revision as of 13:07, 28 November 2017
Excretion is the removal of toxic substances and metabolic waste products[1]. Every organism, from the smallest protist to the largest mammal, must cleanse itself of the potentially toxic by-products of its own vital activities. This process in living things is named elimination, which may be considered to include all of the different mechanisms and processes by which life forms dispose of or gets rid of waste products, harmful substances, and perished portions of the organism[2]. In vertebrate animals, this process is mainly carried out by the lungs, skin and the kidneys[3], with the urinary system being the main excretory system. Excretion through the skin occurs through sweating, which results in the removal of water and small amounts of urea and salts. The kidneys filter about 180 litres of blood everyday and removes urea, toxins, medications, and excess ions through the formation of urine[4].
An example of such is cell excretion process. The cell clears its waste products by bringing the waste products close to the cell membrane and then closing the cell membrane around the waste products, isolating it from the rest of the cell. Then the cell could open the cell membrane on the outside of the cell, letting the products out without losing any cytoplasm or letting anything else in[5].
References
- ↑ Britannicacom. 1. Encyclopedia Britannica. [Online]. Available from: https://www.britannica.com/science/excretion [Accessed 5 December 2016].
- ↑ https://www.britannica.com/science/excretion
- ↑ Wikipediaorg. 2. Wikipediaorg. [Online]. Available from: https://en.wikipedia.org/wiki/Excretion [Accessed 5 December 2016]
- ↑ http://science.jrank.org/pages/2626/Excretory-System-Excretion-in-humans.html
- ↑ https://quatr.us/biology/cells-get-rid-waste-excretion-cell-biology.htm