Besides excess water and salts, what specific nitrogenous waste product do the Kidneys filter from the blood?
Answer
Urea
The urinary system, driven by the kidneys, is the main regulator of liquid waste management. The kidneys perform extensive blood filtration, removing substances that are either present in excess or are toxic metabolic byproducts requiring dissolution in water for removal. Among the key substances filtered are water, various salts, and crucially, urea. Urea is identified specifically as a nitrogenous waste product resulting from the breakdown of proteins and amino acids. Once filtered out of the blood, this substance dissolves into the fluid that becomes urine, which is subsequently stored in the bladder prior to expulsion.
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