scroll to top
Stuck on your essay?
Get ideas from this essay and see how your work stacks up
Word Count: 917
Excretory System Aim To examine and understand the structure function and differences between different types of excretory systems The difference between excretion and egestion is that whereas excretion is the process of removing toxic waste by-products of the bodys metabolism egestion is the removal of indigestible remainssubstances through the alimentary canal Through egestion substances that were not able to be used in the body are removed and through excretion waste products of used substances which are potentially harmful are removed The principal waste products generated by metabolic activities in most animals are water carbon dioxide and nitrogenous wastes Carbon dioxide is mainly excreted by gills lungs or other respiratory surfaces Excretory organs such as kidneys excrete most of the water and nitrogenous wastes Nitrogenous wastes include ammonia uric acid and urea In a process called deamination the amino group is removed from amino acids and is converted to ammonia Ammonia is highly toxic and it may harm the organism if permitted to accumulate inside the body Since it is very soluble in many organisms its quickly converted to some less toxic nitrogenous waste product such as uric acid or urea Other waste products of the body include carbon dioxide which is the product of cellular respiration in which oxygen is used up Carbon dioxide is carried by the plasma in the form of hydrogen carbonates or a smaller portion in the haemoglobin It is carried to the lungs where it is excreted from the body All these compounds especially ammonia are harmful if stored in high concentrations in the body and therefore must be removed Even water which is another by-product is excreted through the kidneys the lungs and the skin where it serves to cool us down or to lower the concentration of water molecules in the blood This is why it is necessary for us to have some form of an excretory system Here is a table
@Kibin is a lifesaver for my essay right now!!
- Sandra Slivka, student @ UC Berkeley
Wow, this is the best essay help I've ever received!
- Camvu Pham, student @ U of M
If I'd known about @Kibin in college, I would have gotten much more sleep
- Jen Soust, alumni @ UCLA