Final answer:
Intraglomerular mesangial cells are responsible for adjusting the glomerular filtration rate, which is critical for maintaining fluid and electrolyte balance in the body.
Step-by-step explanation:
Intraglomerular mesangial cells function to adjust glomerular filtration rate (GFR). These are contractile cells found within the glomerulus that can contract or relax to regulate the filtration rate of blood. The regulation of GFR by the mesangial cells is crucial for maintaining the body's fluid, electrolyte balance, and blood pressure. By adjusting the glomerular filtration rate, these cells help to control how much filtrate is produced, which in turn influences the overall volume and composition of urine.