Urea may be a material thats mainly found within the humans liquid extract. Although the urea is self filtered by the glomeruli majority of the extract is excreted as urine. Almost 50 of the urine consists of Nitrogen (nitrogen excretion composes urea normal conditions) and therefore the factor that are mainly accountable for the urea excretion are glomerular filteration rate increased dietary protein intake water diuretic states and protein catabolic conditions. When the protein intake reduces for a body this suggests that the urea composition also reduces while excreting.