Urine is renal filtrate, which contains metabolic waste products that are toxic to the body. The combination of these toxins is a suspension of urea, urea nitrogen, creatinine and various salts. Salts include phosphates, urates, and salicylates. Secondary urine also contains excess potassium, sodium, chlorine, buffering bases, and hydrogen ions. The continuous process of urine production allows the body to maintain a state of homeostasis.
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