What is one of the primary functions of glomerular filtration?

• A. To synthesize hormones
• B. To control blood pressure
• C. To regulate fluid balance
• D. To transport oxygen

Answer: (C)

One of the primary functions of glomerular filtration is to regulate fluid balance in the body. This process occurs in the kidneys, where blood is filtered through the glomeruli, allowing water, ions, and small molecules to pass while retaining larger molecules and blood cells.

By filtering the blood, the kidneys help maintain homeostasis by controlling the volume and composition of bodily fluids. This regulation is essential for preserving the balance of electrolytes, preventing dehydration, and ensuring that waste products are removed efficiently. As the kidneys filter blood, they not only remove excess water but also adjust the reabsorption of water based on the body's hydration status, further contributing to fluid balance.

In terms of other functions, synthesizing hormones and controlling blood pressure are indeed important roles of the kidneys, but they are secondary to the direct action of glomerular filtration in maintaining fluid homeostasis. Transporting oxygen is primarily the function of red blood cells and the respiratory system. Thus, the role of glomerular filtration in fluid balance is critical for overall body function.