Excretion: Disposal of Nitrogenous Wastes ammonia is too toxic to be stored land animals must...
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Excretion : Disposal of Nitrogenous Wastes • ammonia is too toxic to be stored • land animals must dispose of Nitrogen in different form: Urea or Uric Acid • Urea can be stored in conc’d. form but requires water for disposal
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Transcript of Excretion: Disposal of Nitrogenous Wastes ammonia is too toxic to be stored land animals must...
Excretion: Disposal of Nitrogenous Wastes
• ammonia is too toxic to be stored
• land animals must dispose of Nitrogen in different form: Urea or Uric Acid
• Urea can be stored in conc’d. form but requires water for disposal
• Uric acid allows for water conservation
The Workhorse of the Excretory System: the Kidney
Kidneys filter the blood, helping to regulate the amount of water and salts in the body’s fluids, and thus maintaining homeostasis.
The key functions of the excretory system are:
• Filtration• Reabsorption (from filtrate to blood)• Secretion (from blood to filtrate)• Excretion