What is the primary component of urine?

The primary component of urine is water, which constitutes approximately 95% of its composition. This high water content is essential for the excretion of waste products from the body. The kidneys filter blood, removing excess substances, toxins, and waste materials while retaining necessary substances, leading to urine production.

The remaining components of urine, which include electrolytes, organic solutes, urea, creatinine, and other metabolites, are dissolved in this water. While electrolytes play an important role in maintaining the body's fluid and electrolyte balance, their concentration in urine is significantly less than that of water. Other components like proteins and fatty acids are normally present in much smaller amounts; typically, proteins should not be found in urine in significant quantities, as their presence may indicate a health issue. Thus, water's dominance in urine composition emphasizes its role as a solvent for waste elimination.