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.

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Liquid Excretion: removal of liquid wastes & water/salt balance

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Presentation transcript:

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 Nephron is the functional unit of the Kidney

Details of Nephron Structure

The key functions of the excretory system are: Filtration Reabsorption (from filtrate to blood) Secretion (from blood to filtrate) Excretion

Reabsorption & Secretion in a Nephron